{"product_id":"royal-enfield-exhaust-pipe-assembly-thunderbird-350-rlx00101b","title":"Exhaust Pipe Assembly (Header \/ Bend Pipe) for Royal Enfield Thunderbird 350 bs4 (UCE) – RLX00101\/B","description":"\u003cp\u003eRoyal Enfield \u003cstrong\u003eRLX00101\/B\u003c\/strong\u003e is the genuine OEM \u003cstrong\u003eexhaust pipe assembly\u003c\/strong\u003e (front\/header\/bend pipe) used on the \u003cstrong\u003eThunderbird 350\u003c\/strong\u003e platform. This is the pipe section that routes exhaust gases from the cylinder head toward the silencer\/mid-joint. If your pipe is cracked at the flange, dented from bottom hits, rusted through, or leaking at the head joint (ticking sound, soot marks), replacing the header with the correct OEM routing restores factory alignment, sealing and stress-free mounting.\u003c\/p\u003e\n\u003cp\u003eCustomers also search this part as \u003cem\u003eexhaust header pipe\u003c\/em\u003e, \u003cem\u003ebend pipe\u003c\/em\u003e, \u003cem\u003efront pipe\u003c\/em\u003e, \u003cem\u003edownpipe\u003c\/em\u003e, \u003cem\u003eheader assembly\u003c\/em\u003e, and in workshops as \u003cem\u003e“exhaust bend”\u003c\/em\u003e or \u003cem\u003e“front pipe”\u003c\/em\u003e. OEM matters here because incorrect bend angles can cause silencer misalignment, vibration, premature gasket leaks, and contact with chassis\/footrest mounts.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eBefore you buy:\u003c\/strong\u003e confirm your bike is a Thunderbird 350 (UCE) and match the pipe shape + flange style with your existing unit (share a clear photo if unsure).\u003c\/p\u003e\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eGenuine Royal Enfield part: \u003cstrong\u003eRLX00101\/B\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eCorrect OEM routing and bend geometry for stress-free exhaust fitment\u003c\/li\u003e\n\u003cli\u003eFixes header cracks, dents, rust perforation, and exhaust-leak “ticking” at the head\u003c\/li\u003e\n\u003cli\u003eHelps restore stock mounting alignment (reduces vibration\/rattle from misfit pipes)\u003c\/li\u003e\n\u003cli\u003eDesigned to seal correctly with the proper exhaust gasket at the cylinder head\u003c\/li\u003e\n\u003cli\u003eIdeal when replacing a silencer kit and your original header is weak\/damaged\u003c\/li\u003e\n\u003cli\u003eCompatible only where the Royal Enfield parts catalog matches RLX00101\/B (see table)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eCompatibility Table \u003c\/h2\u003e\n\u003ctable cellspacing=\"0\" cellpadding=\"6\" border=\"1\"\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eModel\u003c\/th\u003e\n\u003cth\u003ePlatform\/Engine\u003c\/th\u003e\n\u003cth\u003eBS\/Emission\u003c\/th\u003e\n\u003cth\u003eYears\u003c\/th\u003e\n\u003cth\u003eStatus (✅\/❓)\u003c\/th\u003e\n\u003cth\u003eNotes\/Constraints\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eThunderbird 350 (NTB)\u003c\/td\u003e\n\u003ctd\u003eUCE 346cc (Thunderbird platform)\u003c\/td\u003e\n\u003ctd\u003e— (verify)\u003c\/td\u003e\n\u003ctd\u003e— (verify by VIN \/ photos)\u003c\/td\u003e\n\u003ctd\u003e✅\u003c\/td\u003e\n\u003ctd\u003eConfirmed as “EXHAUST PIPE ASSEMBLY - TB350CC” for RLX00101\/B. Match flange + pipe bends with your old part.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cbr\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cbr\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cbr\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cbr\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cbr\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cbr\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cbr\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cbr\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cbr\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cbr\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cbr\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cbr\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cbr\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cbr\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cbr\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cbr\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch2\u003eVariants\u003c\/h2\u003e\n\u003cp\u003eNo variants.\u003c\/p\u003e\n\u003ch2\u003eFAQs\u003c\/h2\u003e\n\u003ch3\u003eQ1 (Fitment): How do I confirm RLX00101\/B fits my Thunderbird 350?\u003c\/h3\u003e\n\u003cp\u003eMatch three things: (1) your bike is a \u003cstrong\u003eRoyal Enfield Thunderbird 350 (UCE)\u003c\/strong\u003e, (2) your old pipe’s \u003cstrong\u003eflange shape\/bolt spacing\u003c\/strong\u003e matches, and (3) the \u003cstrong\u003ebend route\u003c\/strong\u003e is the same (clear side photo). If you want “zero wrong order”, share a photo of the old pipe from the head flange to the first mounting point before dispatch.\u003c\/p\u003e\n\u003ch3\u003eQ2 (Fitment): Will this fit Thunderbird 350X \/ BS4 Thunderbird 350?\u003c\/h3\u003e\n\u003cp\u003eOnly For Thunderbird 350 bs4 which has no oxygen sensor. (Check Part Number)\u003c\/p\u003e\n\u003ch3\u003eQ3 (Comparison): Genuine OEM vs local\/aftermarket bend pipe—what’s the real difference?\u003c\/h3\u003e\n\u003cp\u003eAftermarket pipes often differ in bend angle, flange thickness, and bracket alignment, which can cause silencer misfit, vibration cracks and gasket leaks. OEM is made to the original geometry so it bolts up without forcing or “jugaad” spacers.\u003c\/p\u003e\n\u003ch3\u003eQ4 (Installation): Any precautions while installing an exhaust header pipe?\u003c\/h3\u003e\n\u003cp\u003eInstall with a fresh exhaust gasket if needed, tighten head nuts evenly, and re-check after a heat cycle. Avoid forcing the silencer alignment—fit the header first, then mid\/silencer. Do not pressure-wash directly at joints until fully cooled.\u003c\/p\u003e\n\u003ch3\u003eQ5 (Symptoms): What problems does this pipe solve?\u003c\/h3\u003e\n\u003cp\u003eExhaust leak\/ticking at the head, soot marks near the flange, cracked\/dented header, rust perforation, and silencer alignment issues caused by a bent pipe.\u003c\/p\u003e\n\u003ch3\u003eQ6 (Returns-prevention): What should I send to confirm before shipping?\u003c\/h3\u003e\n\u003cp\u003eSend (1) your bike model + year (or VIN last 6 digits), and (2) clear photos of your old pipe (head flange + full side route). This prevents ordering the wrong Thunderbird variant or confusing it with Classic\/Bullet\/Electra pipes.\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"Royal Enfield","offers":[{"title":"Default Title","offer_id":51053602963751,"sku":"RLX00101B","price":6130.0,"currency_code":"INR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0878\/7447\/0183\/files\/RLX00101_B_genuine_exhaust_pipe_assembly_header_for_Royal_Enfield_Thunderbird_350_UCE.png?v=1771570987","url":"https:\/\/underthehood.co.in\/products\/royal-enfield-exhaust-pipe-assembly-thunderbird-350-rlx00101b","provider":"UNDER THE HOOD","version":"1.0","type":"link"}