Silmen (Silman) Bullet 350 “Battalion” C-Bend Pipe – Dual/Double O2 Sensor – Chrome (LPA21) | Free-Flow Exhaust Header

Upgrade your Royal Enfield’s exhaust flow and classic chrome look with the Silmen/Silman C-Type Free-Flow Bend Pipe (Dual/Double Sensor), commonly searched as “Battalion C bend pipe” or “double sensor bend pipe”. This bend pipe is designed for new-generation Bullet/Standard & Reborn-style setups that use dual O2 sensor ports, helping maintain ECU feedback while improving exhaust breathing and sound when paired with a compatible silencer.

Unlike generic aftermarket pipes, this is a C-type free-flow design that enthusiasts choose for stronger bass / louder note and a cleaner “old-school” vibe—especially on Battalion-style builds. However, note that free-flow bend pipes can be louder than stock and may attract traffic challan depending on local enforcement. 

Fitment is validated via multiple aftermarket dealer listings for Bullet 350 Battalion/2024–25 models and Reborn Classic / New Standard Battalion 2025 double-sensor setups, but you must match your bike’s sensor count and stock pipe routing before ordering. 

Key Features

• Dual/Double O2 sensor ports to suit dual-sensor exhaust setups 

• C-Type free-flow internal design for higher exhaust flow

• Chrome finish for premium, classic appearance 

• Helps deliver a deeper / louder exhaust note with compatible silencer 

• Direct replacement style installation on supported setups (no permanent mods typically) 

• Built for riders doing Battalion / retro-standard conversions (visual + sound upgrade)

• Important compliance note: may be challan-prone due to sound/emissions enforcement 

Compatibility Table 

How to confirm on your bike (zero-returns check): Count O2 sensors on your current header (single vs dual), and match the shape/routing of the stock bend pipe before ordering.

Variants 

• Dual/Double Sensor – Chrome (this listing)

• Dual/Double Sensor – Black (only if you stock it)

• Single Sensor version (only if you stock it; do not mix fitment on invoices)

FAQs

1. What does “double sensor / dual sensor” mean?
   It means the bend pipe has two O2 sensor ports for bikes that use a dual-sensor ECU/exhaust feedback setup. 

2. Will this fit my Bullet 350 Battalion Black?
   Yes for 2024–2025 Battalion/New Bullet setups as per dealer listings, but confirm your sensor count + pipe routing before ordering. 

3. Is it legal / will I get challan?
   Free-flow pipes can be louder than stock, and some sellers explicitly warn about challan risk under traffic rules depending on your city and enforcement. 

4. Do I need ECU remap or will the check-engine light come on?
   Dual-sensor ports are intended to keep O2 sensors connected for ECU readings; however, results vary by silencer/cat-delete setup. Keep sensors installed and sealed properly. 

5. What’s in the box?
   1× C-Bend Pipe (Chrome, Dual Sensor). Gaskets/fasteners depend on your installation—reuse OEM or replace if worn.