HKK Indore HKMB6C Dual-Sensor Long C Bend Pipe for Royal Enfield J-Series 350

Replace the restrictive or damaged original exhaust header with the HKK Indore HKMB6C Long Bend “C” Pipe, made for compatible Royal Enfield J-Series 350 motorcycles using a dual oxygen-sensor exhaust arrangement.

The pipe combines a bright chrome bend with a long black protective heat shield carrying HKK “Old Is Gold” styling. Its dual threaded sensor ports make it suitable for the supported newer exhaust configuration used on compatible Classic 350 Reborn, Meteor 350 and New Bullet 350 / New Standard motorcycles.

Please note: This is an HKK Indore aftermarket bend pipe. It is not a Royal Enfield genuine or OEM exhaust component.

Key Features

• HKK Indore manufacturer code HKMB6C
• Long Bend “C” type exhaust/header pipe
• Dual oxygen-sensor ports
• Chrome pipe with black protective heat shield
• HKK “Old Is Gold” cut-out styling on the shield
• Made for compatible Royal Enfield J-Series 350 applications
• Replacement or custom exhaust conversion component
• One complete bend-pipe assembly supplied

Confirmed Compatibility

Important Dual-Sensor Check

This is the double-sensor version. Before ordering, inspect your existing bend pipe and confirm that your motorcycle uses two oxygen-sensor locations matching this pipe.

Do not order this version for a motorcycle using:

• A single-sensor bend pipe
• A bend pipe without an oxygen-sensor port
• A different sensor spacing or thread arrangement
• An older UCE exhaust system

Check Before Ordering

Please verify the following before placing your order:

• Exact motorcycle model and manufacturing year
• J-Series 350 platform
• Two oxygen sensors are used on the existing exhaust
• Sensor positions and thread size match
• Engine-head connection and flange arrangement match
• Rear silencer connection matches
• Whether the original catalytic converter is being retained or replaced
• Required exhaust gaskets and mounting hardware

Fitment Not Confirmed

• Hunter 350
• Goan Classic 350

These motorcycles use related J-Series architecture, but the pipe routing, bracket position, silencer connection and sensor arrangement must be matched before ordering.

Do Not Order For

• Classic 350 UCE
• Classic 500 UCE
• Bullet Standard 350 / 500 UCE
• Electra 350 / 500 UCE
• Thunderbird 350 / 500
• Himalayan 411 or Scram 411
• Himalayan 450 or Guerrilla 450
• Interceptor 650 or Continental GT 650
• Super Meteor 650, Shotgun 650, Bear 650 or Classic 650

What This Product Is

• One HKK Indore aftermarket exhaust bend/header pipe
• A long C-type pipe for supported J-Series 350 models
• A dual-sensor exhaust pipe with two threaded sensor ports
• A chrome pipe with an attached black heat shield

What This Product Is Not

• Not a rear silencer or muffler
• Not a complete exhaust system with silencer
• Not a Royal Enfield genuine bend pipe
• Not a single-sensor pipe
• Not a no-sensor carburettor-model pipe
• Not an exhaust sensor
• Not suitable for older UCE motorcycles

Design and Finish

The HKMB6C uses a bright chrome-finish curved pipe with a long black outer shield. The shield helps cover the hot pipe section and adds a model-specific custom appearance through its HKK “Old Is Gold” cut-out design.

The product label identifies it as:

• Code: HKMB6C
• Description: Long Bend “C” C+B Pipe
• Sensor Type: Double Sensor

Exhaust and Sound Expectations

Changing the original bend pipe can alter exhaust flow and sound, particularly when combined with an aftermarket silencer. The final result depends on the silencer, catalytic-converter arrangement, engine condition and installation.

No fixed loudness, performance or mileage result is promised. Review a vehicle-specific sound video before ordering when the exhaust note is your main consideration.

What’s Included

• 1 × HKK Indore HKMB6C Long C bend pipe
• Attached black HKK heat shield
• Two threaded oxygen-sensor provisions

Not Included

• Oxygen sensors
• Rear silencer
• Engine-head exhaust gasket
• Silencer-joint gasket or sealing sleeve
• Mounting bolts, nuts or washers unless physically supplied
• ECU tuning or installation service

Parts You May Need During Installation

• Correct engine-head exhaust gasket
• Silencer-joint gasket or sealing sleeve
• Correct mounting hardware
• Anti-seize compound suitable for oxygen-sensor threads
• Compatible rear silencer

Installation Guidance

• Professional installation is strongly recommended.
• Allow the engine and exhaust to cool completely before removal.
• Compare both sensor positions with the original pipe before fitting.
• Transfer the oxygen sensors carefully without twisting or damaging their wiring.
• Do not interchange the sensors unless the service procedure allows it.
• Use the correct sensor and exhaust-gasket torque specifications.
• Confirm adequate clearance from the frame, engine, brake pedal and footrests.
• Check for exhaust leakage and warning lights after installation.
• Recheck all fasteners after the first full heat cycle.

Care and Maintenance

• Allow the pipe to cool fully before cleaning.
• Use mild automotive shampoo and a soft microfibre cloth.
• Avoid acidic wheel cleaners and abrasive pads.
• Dry the chrome and black surfaces after washing.
• Inspect the sensor ports and wiring periodically.
• Check the engine-end and silencer-end joints for leakage.
• Heat-related colour change may occur on chrome exhaust pipes during normal use.

Important Fitment and Return Note

This is a model- and sensor-configuration-specific exhaust component. Confirm the motorcycle model, year, dual-sensor arrangement, sensor position, pipe routing and both exhaust joints before installation.

Do not start the motorcycle until the fitment has been completely checked. Once installed or heated, the pipe may develop tool marks, sensor-installation marks, carbon deposits or heat-related finish changes.

Compliance Note

Replacing the original exhaust bend pipe or catalytic-converter section may affect noise, emissions, warning-light behaviour and road-use compliance. Requirements vary by motorcycle and location. No road-use, BS6, emission or PUC approval should be assumed unless supported by product-specific certification.

Frequently Asked Questions

What is HKMB6C?

HKMB6C is the HKK Indore code for this Long Bend “C” Chrome + Black double-sensor exhaust pipe.

Is this a silencer?

No. This is the bend/header pipe that connects the engine exhaust outlet to the rear silencer.

Which motorcycles does it fit?

It is intended for compatible dual-sensor versions of Classic 350 Reborn, Meteor 350 and the new Bullet 350 / New Standard J-Series.

Does it fit the old Bullet Standard 350?

No. The older Bullet Standard uses the UCE platform and requires a different bend pipe.

Does it fit Classic 350 UCE?

No. This product is for compatible newer J-Series dual-sensor exhaust arrangements.

Does it have two sensor ports?

Yes. The product label and physical pipe show two threaded oxygen-sensor provisions.

Are the oxygen sensors included?

No. The sensors must be transferred from the motorcycle or purchased separately if required.

Is the heat shield included?

Yes. The displayed pipe includes the attached black HKK “Old Is Gold” heat shield.

Is the rear silencer included?

No. This listing is for the bend pipe only.

Is it a free-flow pipe?

The pipe may change the exhaust-flow path compared with the original system, but no exact internal or performance specification is promised beyond the physical product shown.

Will it make the motorcycle louder?

It may change the exhaust sound, especially when paired with an aftermarket silencer. The final sound depends on the complete exhaust system.

Will it improve power or mileage?

No specific horsepower, torque, pickup or mileage improvement is promised.

Can it cause an engine warning light?

Incorrect sensor installation, damaged wiring, an exhaust leak or an incompatible exhaust configuration may trigger a warning light. Professional installation is recommended.

Can it be returned after installation?

Please review the current Under The Hood return policy before ordering. Installed or heated exhaust components can show immediate fitting and heat marks.

Buyer Search Names

• HKK Indore HKMB6C bend pipe
• Classic 350 Reborn dual sensor bend pipe
• Meteor 350 double sensor exhaust pipe
• Bullet 350 J-Series dual O2 bend pipe
• New Standard 350 bend pipe
• J-Series 350 long C bend pipe
• HKK chrome black exhaust header
• Double oxygen sensor bend pipe

Royal Enfield and the listed motorcycle model names are trademarks or model names of their respective owner. This is an aftermarket HKK Indore product and is not a Royal Enfield genuine spare part.