{"product_id":"silman-lsm4b-short-punjab-big-mouth-57mm-black-silencer-reborn-meteor-bullet-350","title":"Silman Short Punjab Big Mouth 57mm Black Silencer for Classic 350 Reborn, Meteor 350 \u0026 Bullet 350 J-Series | LSM4-B","description":"\u003ch1\u003eSilman LSM4-B Short Punjab Big Mouth 57mm Matte Black Silencer for Royal Enfield J-Series 350\u003c\/h1\u003e\n\n\u003cp\u003e\u003cstrong\u003eSilman LSM4-B\u003c\/strong\u003e is the matte-black \u003cstrong\u003eShort Punjab \/ Punjabi-style Big Mouth free-flow silencer\u003c\/strong\u003e sold for Royal Enfield's modern J-Series 350 family. It is aimed at riders who want a deeper, more traditional Punjab-style exhaust note and a cleaner blacked-out rear profile than the bulky factory silencer.\u003c\/p\u003e\n\n\u003cp\u003eThis is the \u003cstrong\u003eBig Mouth\u003c\/strong\u003e version. The Silman carton for this exact part is marked \u003cstrong\u003eLSM4-B\u003c\/strong\u003e and \u003cstrong\u003e7\" × 2.25\"\u003c\/strong\u003e. A 2.25-inch mouth is approximately \u003cstrong\u003e57.15 mm\u003c\/strong\u003e, which is why this exhaust is commonly searched and sold as the \u003cstrong\u003e57 mm \/ 57mm Big Mouth Short Punjab\u003c\/strong\u003e silencer.\u003c\/p\u003e\n\n\u003cdiv style=\"padding:14px;border:2px solid #111;background:#f7f7f7;margin:16px 0;\"\u003e\n\u003cstrong\u003eQUICK PRODUCT CHECK\u003c\/strong\u003e\u003cbr\u003e\nBrand: \u003cstrong\u003eSilman Auto Parts\u003c\/strong\u003e\u003cbr\u003e\nModel \/ Code: \u003cstrong\u003eLSM4-B \/ LSM 4B\u003c\/strong\u003e\u003cbr\u003e\nStyle: \u003cstrong\u003eShort Punjab \/ Punjabi Big Mouth\u003c\/strong\u003e\u003cbr\u003e\nMouth Size Class: \u003cstrong\u003e2.25 inch ≈ 57 mm\u003c\/strong\u003e\u003cbr\u003e\nFinish: \u003cstrong\u003eMatte Black\u003c\/strong\u003e\u003cbr\u003e\nDesign: \u003cstrong\u003eFree-flow \/ without filter-baffle style\u003c\/strong\u003e\u003cbr\u003e\nPrimary Fitment: \u003cstrong\u003eRoyal Enfield Classic 350 Reborn J-Series\u003c\/strong\u003e\u003cbr\u003e\nAlso Marketed For: \u003cstrong\u003eMeteor 350 \u0026amp; New Bullet 350 (2023+ J-Series)\u003c\/strong\u003e\u003cbr\u003e\nProduct Type: \u003cstrong\u003eAftermarket Exhaust Silencer – not Royal Enfield Genuine\u003c\/strong\u003e\n\u003c\/div\u003e\n\n\u003ch2\u003eImportant Identification: This Is LSM4-B, Not the UCE LSA4B\u003c\/h2\u003e\n\n\u003cp\u003eSilman uses similar-looking model families for older UCE motorcycles and newer J-Series motorcycles. Buyers should not order only by the words “Short Punjab Big Mouth”.\u003c\/p\u003e\n\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eSilman Code \/ Family\u003c\/th\u003e\n\u003cth\u003eTypical Application\u003c\/th\u003e\n\u003cth\u003eDo Not Confuse\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eLSM4-B \/ LSM 4B\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eJ-Series Short Punjab Big Mouth, Matte Black\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eThis listing\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLSA4B \/ LSA4-B\u003c\/td\u003e\n\u003ctd\u003eOlder UCE Classic \/ Standard \/ Electra Big Mouth Black\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eDifferent fitment family\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003cp\u003eIf you own an older UCE Classic, Bullet Standard or Electra, do not buy this LSM4-B listing simply because both products are called “Short Punjab”. Use the correct UCE silencer family instead.\u003c\/p\u003e\n\n\u003ch2\u003eVerified \/ Market-Supported Fitment\u003c\/h2\u003e\n\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eMotorcycle\u003c\/th\u003e\n\u003cth\u003eStatus\u003c\/th\u003e\n\u003cth\u003eFitment Note\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eRoyal Enfield Classic 350 Reborn\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eConfirmed application\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eSilman LSM4B is specifically sold by specialist Royal Enfield accessory sellers for the Classic 350 Reborn J-Series.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eRoyal Enfield Meteor 350\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eMarket-supported application\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eLSM4B \/ equivalent J-Series Big Mouth Black listings are sold for Meteor 350 together with Classic Reborn and New Bullet 350. The matching LSM4-A chrome family is also marketed for Reborn\/Meteor J-Series fitment.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eRoyal Enfield Bullet 350 – New J-Series, 2023+\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eMarket-supported application\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eCurrent LSM 4B marketplace listings specifically include Bullet 2023 \/ New Bullet 350 with Classic Reborn and Meteor 350.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eBullet 350 Battalion Black\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eVerify before installation\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eBattalion is part of the current New Bullet 350 J-Series family, but compare the stock header outlet, clamp and mounting alignment before final fitment.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHunter 350\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eNot claimed in this listing\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eDo not assume compatibility only because Hunter also uses a J-Series engine; exhaust routing and mounting should be checked separately.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eClassic 350 \/ 500 UCE, Electra UCE, old Bullet UCE\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eNot compatible as this J-Series SKU\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eUse the older UCE Short Punjab family such as LSA4B where appropriate.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch2\u003eWhat “57 mm Big Mouth” Means\u003c\/h2\u003e\n\n\u003cp\u003eThe exact LSM4-B carton carries the marking \u003cstrong\u003e7\" × 2.25\"\u003c\/strong\u003e. The \u003cstrong\u003e2.25-inch dimension converts to approximately 57.15 mm\u003c\/strong\u003e. In Indian Royal Enfield accessory terminology this places the silencer in the \u003cstrong\u003e57 mm Big Mouth\u003c\/strong\u003e class.\u003c\/p\u003e\n\n\u003cp\u003eBecause sellers sometimes use “57 mm” as a market name rather than a laboratory bore measurement, this listing describes it as a \u003cstrong\u003e57 mm \/ 2.25-inch Big Mouth class\u003c\/strong\u003e instead of claiming a precision-machined 57.00 mm internal bore.\u003c\/p\u003e\n\n\u003ch2\u003eShort Punjab vs Small Mouth – Choose the Correct Sound Style\u003c\/h2\u003e\n\n\u003cp\u003eSilman offers both small-mouth and big-mouth Short Punjab exhausts. They are not the same product.\u003c\/p\u003e\n\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eStyle\u003c\/th\u003e\n\u003cth\u003eOutlet\u003c\/th\u003e\n\u003cth\u003eTypical Sound Character\u003c\/th\u003e\n\u003cth\u003eBest For\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eLSM4-B Big Mouth – this listing\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eApprox. 57 mm \/ 2.25 in class\u003c\/td\u003e\n\u003ctd\u003eDeeper, fuller and more open Punjab-style note\u003c\/td\u003e\n\u003ctd\u003eRiders prioritising bass, presence and a wide-mouth look\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSmall Mouth Short Punjab\u003c\/td\u003e\n\u003ctd\u003eNarrower outlet\u003c\/td\u003e\n\u003ctd\u003eTighter, sharper and more traditional rhythmic thump\u003c\/td\u003e\n\u003ctd\u003eRiders who want a less open outlet and a more compact sound character\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003cp\u003eActual exhaust sound depends heavily on the motorcycle, catalytic converter, bend pipe, engine load, tune and whether the rest of the exhaust system is stock.\u003c\/p\u003e\n\n\u003ch2\u003eWhy Buyers Choose the Silman LSM4-B\u003c\/h2\u003e\n\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eRecognised Silman brand:\u003c\/strong\u003e a known name in Royal Enfield aftermarket silencers rather than an unidentified marketplace copy.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBig-mouth 57 mm class:\u003c\/strong\u003e aimed at riders searching specifically for a wide-mouth Punjabi exhaust.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMatte black finish:\u003c\/strong\u003e suits blacked-out Reborn, Meteor and New Bullet builds.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompact Punjab profile:\u003c\/strong\u003e visually cleaner and shorter-looking than many stock-style mufflers.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFree-flow construction:\u003c\/strong\u003e more open exhaust architecture than a stock heavily baffled silencer.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eJ-Series-specific market fitment:\u003c\/strong\u003e LSM4B should not be confused with UCE Short Punjab products.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eWhat We Will Not Claim\u003c\/h2\u003e\n\n\u003cp\u003eMany online silencer listings make automatic claims such as “more horsepower”, “faster acceleration”, “better mileage”, “optimized back pressure” or “no tuning required”. Those results are not guaranteed by the silencer alone.\u003c\/p\u003e\n\n\u003cp\u003eThis product is being sold for its \u003cstrong\u003efitment, Silman construction, matte-black appearance, Big Mouth 57 mm profile and exhaust-sound character\u003c\/strong\u003e. Any measurable performance change depends on the complete exhaust system, fuel calibration and engine condition.\u003c\/p\u003e\n\n\u003ch2\u003eSound Expectation\u003c\/h2\u003e\n\n\u003cp\u003eThe Big Mouth Short Punjab category is generally chosen for a \u003cstrong\u003edeeper, louder and more bass-heavy exhaust note\u003c\/strong\u003e than the stock J-Series muffler. The 57 mm \/ 2.25-inch outlet gives it a visibly open tail end and a stronger exhaust presence.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eSound cannot be guaranteed from photographs or dimensions alone.\u003c\/strong\u003e A stock catalytic converter will usually control sound differently from a free-flow bend pipe or de-cat system. Two motorcycles using the same silencer can therefore sound different.\u003c\/p\u003e\n\n\u003ch2\u003eFree-Flow \/ Without Filter Design\u003c\/h2\u003e\n\n\u003cp\u003eExact LSM4-B competitor listings describe the product as a \u003cstrong\u003ewithout-filter \/ free-flow silencer\u003c\/strong\u003e. That is an important buying point for customers comparing it with filtered, glass-wool, stock-replica or heavily baffled exhausts.\u003c\/p\u003e\n\n\u003cp\u003eA more open exhaust can increase sound substantially. It can also change the way exhaust pulses are perceived. Buyers looking for a stock-like quiet replacement should choose a stock replica or glass-wool silencer instead.\u003c\/p\u003e\n\n\u003ch2\u003eMatte Black Finish\u003c\/h2\u003e\n\n\u003cp\u003eThe silencer uses a black high-temperature-style finish designed to match the dark exhaust and engine theme on modern Royal Enfield models. Like any painted\/coated exhaust part, the surface is exposed to very high heat, rain, road dirt and cleaning chemicals.\u003c\/p\u003e\n\n\u003cul\u003e\n\u003cli\u003eClean only after the exhaust has cooled completely.\u003c\/li\u003e\n\u003cli\u003eAvoid aggressive acid-based wheel cleaners.\u003c\/li\u003e\n\u003cli\u003eDo not use abrasive metal polish on the matte finish.\u003c\/li\u003e\n\u003cli\u003eHeat cycling can naturally change surface appearance over time.\u003c\/li\u003e\n\u003cli\u003eWipe off mud and road salts instead of allowing them to remain baked onto the coating.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eFitment \u0026amp; Installation\u003c\/h2\u003e\n\n\u003cp\u003eSpecialist listings sell the J-Series LSM4B as a bolt-on silencer and commonly supply an adaptor bush \/ rubber or related mounting pieces. However, motorcycles that have been previously modified may no longer have the original header, clamp or mounting position.\u003c\/p\u003e\n\n\u003cp\u003eBefore tightening anything permanently:\u003c\/p\u003e\n\n\u003col\u003e\n\u003cli\u003eConfirm the motorcycle is a compatible J-Series model.\u003c\/li\u003e\n\u003cli\u003eCompare the silencer inlet with the existing header\/bend pipe.\u003c\/li\u003e\n\u003cli\u003eCheck the mounting bracket position against the motorcycle's silencer hanger.\u003c\/li\u003e\n\u003cli\u003eUse the correct adaptor bush \/ clamp arrangement supplied for the application.\u003c\/li\u003e\n\u003cli\u003eAlign the silencer so it does not touch the swingarm, brake components, tyre or bodywork.\u003c\/li\u003e\n\u003cli\u003eTighten the inlet and rear mounting points progressively.\u003c\/li\u003e\n\u003cli\u003eStart the engine and check carefully for exhaust leakage around the joint.\u003c\/li\u003e\n\u003cli\u003eAfter the first heat cycles, recheck all fasteners once the exhaust is completely cool.\u003c\/li\u003e\n\u003c\/ol\u003e\n\n\u003ch2\u003eStock Bend Pipe vs Free-Flow Bend Pipe\u003c\/h2\u003e\n\n\u003cp\u003eThe same silencer can behave and sound very differently depending on what is fitted before it.\u003c\/p\u003e\n\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eSetup\u003c\/th\u003e\n\u003cth\u003eExpected Character\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eStock header \/ catalytic system + LSM4-B\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eUsually the more restrained option; retains more of the factory exhaust restriction and emissions hardware.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eFree-flow \/ de-cat bend pipe + LSM4-B\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eTypically louder and more open; may materially change emissions, fuelling behaviour and legal road compliance.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003cp\u003eNo claim is made that removing emissions equipment is legal for public-road use.\u003c\/p\u003e\n\n\u003ch2\u003eRoad-Legal \/ Noise \u0026amp; Emissions Note\u003c\/h2\u003e\n\n\u003cp\u003eThis is an \u003cstrong\u003eaftermarket free-flow silencer\u003c\/strong\u003e. Exhaust-noise and emissions regulations vary by jurisdiction, and changing the factory silencer can affect compliance. The product should not be described as “challan-free”, “RTO approved”, “legal everywhere” or “same noise as stock” unless documentary certification exists for the exact setup.\u003c\/p\u003e\n\n\u003cp\u003eFor public-road use, the buyer is responsible for ensuring the installed motorcycle complies with applicable noise and emissions requirements.\u003c\/p\u003e\n\n\u003ch2\u003ePackage Contents\u003c\/h2\u003e\n\n\u003cul\u003e\n\u003cli\u003e1 × Silman LSM4-B Short Punjab Big Mouth matte-black silencer\u003c\/li\u003e\n\u003cli\u003eAdaptor \/ bush \/ fitting piece as supplied with the current Silman batch\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003eNot included unless explicitly supplied in your pack:\u003c\/strong\u003e bend pipe\/header, catalytic converter, O2 sensors, rear mounting bolts, custom bracket, heat shield, motorcycle or the Under The Hood key strap visible in product photographs.\u003c\/p\u003e\n\n\u003ch2\u003eBefore You Order – 8 Buyer Checks\u003c\/h2\u003e\n\n\u003col\u003e\n\u003cli\u003e\n\u003cstrong\u003eCheck the code:\u003c\/strong\u003e LSM4-B \/ LSM 4B.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCheck the platform:\u003c\/strong\u003e J-Series 350, not older UCE.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCheck the mouth:\u003c\/strong\u003e Big Mouth, approximately 57 mm \/ 2.25-inch class.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCheck the finish:\u003c\/strong\u003e Matte Black.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCheck your model:\u003c\/strong\u003e Reborn, Meteor 350 or New Bullet 350 application.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCheck your existing bend pipe:\u003c\/strong\u003e previous exhaust modifications can change compatibility.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCheck sound preference:\u003c\/strong\u003e this is a free-flow\/louder-style silencer, not a stock-sound muffler.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCheck local road regulations\u003c\/strong\u003e before using a modified exhaust on public roads.\u003c\/li\u003e\n\u003c\/ol\u003e\n\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\n\u003cp\u003e\u003cstrong\u003e1. Is this Silman LSM4-B?\u003c\/strong\u003e\u003cbr\u003e\nYes. The photographed carton is marked \u003cstrong\u003eSilman Silencers – Code LSM4-B\u003c\/strong\u003e.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003e2. Is LSM4-B the black version?\u003c\/strong\u003e\u003cbr\u003e\nYes. In Silman's LSM4 family, the “B” version is sold in black, while LSM4-A is the corresponding chrome-market version.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003e3. Is this Short Punjab or Long Punjab?\u003c\/strong\u003e\u003cbr\u003e\nIn current J-Series accessory listings, \u003cstrong\u003eLSM4B is sold as the Short Punjab Big Mouth Black silencer\u003c\/strong\u003e. Some older packaging\/retailer descriptions use “Long Silencer \/ Meteor” terminology for the same code family, which is why model-code identification is more reliable than depending on only one market nickname.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003e4. Is it 57 mm?\u003c\/strong\u003e\u003cbr\u003e\nThe box is marked \u003cstrong\u003e2.25 inches\u003c\/strong\u003e, which converts to approximately \u003cstrong\u003e57.15 mm\u003c\/strong\u003e. It is therefore correctly marketed in the 57 mm Big Mouth class.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003e5. Does it fit Classic 350 Reborn?\u003c\/strong\u003e\u003cbr\u003e\nYes. That is the strongest directly documented LSM4B application from specialist Silman sellers.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003e6. Does it fit Meteor 350?\u003c\/strong\u003e\u003cbr\u003e\nCurrent LSM 4B Big Mouth Black market listings include Meteor 350 together with Classic Reborn and New Bullet 350. The paired LSM4-A chrome family is also sold for Reborn\/Meteor J-Series applications.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003e7. Does it fit the New Bullet 350?\u003c\/strong\u003e\u003cbr\u003e\nCurrent LSM 4B marketplace listings specifically include the 2023+ New Bullet 350 along with Reborn and Meteor 350. Verify the bike is still using the compatible stock-style header and mounting arrangement.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003e8. Does it fit Battalion Black?\u003c\/strong\u003e\u003cbr\u003e\nBattalion Black belongs to the current New Bullet 350 J-Series family. Because this exact Silman code is marketed broadly for New Bullet 350 rather than separately by trim, compare the header\/mounting setup before final installation.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003e9. Does it fit Hunter 350?\u003c\/strong\u003e\u003cbr\u003e\nHunter 350 is \u003cstrong\u003enot claimed in this listing\u003c\/strong\u003e. Do not assume compatibility merely because it uses a J-Series engine.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003e10. Does it fit old Classic \/ Standard \/ Electra UCE?\u003c\/strong\u003e\u003cbr\u003e\nNot as this LSM4-B J-Series SKU. Silman sells separate UCE Short Punjab codes such as the LSA4B family.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003e11. Is this a small-mouth silencer?\u003c\/strong\u003e\u003cbr\u003e\nNo. This is the \u003cstrong\u003eBig Mouth\u003c\/strong\u003e version. For the narrower outlet, select the Small Mouth Short Punjab model.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003e12. Is it louder than the stock silencer?\u003c\/strong\u003e\u003cbr\u003e\nIt is a free-flow Big Mouth aftermarket silencer and is generally selected for a deeper\/louder note than stock. Exact loudness depends on the complete exhaust setup.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003e13. Does it include a DB killer?\u003c\/strong\u003e\u003cbr\u003e\nThe exact LSM4-B is marketed as a without-filter \/ free-flow style. Do not assume a removable DB killer is included unless the supplied batch explicitly contains one.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003e14. Will this increase horsepower?\u003c\/strong\u003e\u003cbr\u003e\nNo fixed power increase is promised. Any performance change depends on the complete engine, exhaust and fuelling setup.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003e15. Do I need a free-flow bend pipe?\u003c\/strong\u003e\u003cbr\u003e\nNo. The silencer can be used as a slip-on style replacement on a compatible setup. Changing the bend pipe is a separate modification and can substantially increase sound and alter emissions behaviour.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003e16. Is it Royal Enfield Genuine?\u003c\/strong\u003e\u003cbr\u003e\nNo. This is a \u003cstrong\u003eSilman Auto Parts aftermarket silencer\u003c\/strong\u003e.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003e17. What is the box MRP?\u003c\/strong\u003e\u003cbr\u003e\nThe photographed August 2026 Silman pack shows an MRP of \u003cstrong\u003e₹2,276 inclusive of taxes\u003c\/strong\u003e. Retail selling prices can be lower than MRP.\u003c\/p\u003e\n\n\u003ch2\u003eBuyer Search Terms\u003c\/h2\u003e\n\n\u003cp\u003eSilman LSM4-B, Silman LSM4B silencer, Silmen LSM4B, Short Punjab silencer Reborn, Short Punjab silencer Meteor 350, New Bullet 350 short Punjab silencer, 57mm silencer Royal Enfield, 57 mm Big Mouth silencer, 2.25 inch silencer, Black Punjab silencer, Matte Black Reborn silencer, Classic 350 Reborn loud silencer, Meteor 350 free flow silencer, Bullet 350 2023 silencer, J Series silencer, Punjabi silencer Royal Enfield, dug dug silencer, thump silencer, big mouth exhaust Royal Enfield.\u003c\/p\u003e","brand":"Silman","offers":[{"title":"Default Title","offer_id":52384699875623,"sku":null,"price":1899.0,"currency_code":"INR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0878\/7447\/0183\/files\/777791BE-9B19-45F1-B99B-BFDBFA111CD6.jpg?v=1792492375","url":"https:\/\/underthehood.co.in\/products\/silman-lsm4b-short-punjab-big-mouth-57mm-black-silencer-reborn-meteor-bullet-350","provider":"UNDER THE HOOD","version":"1.0","type":"link"}