Genuine BMW M Performance Titanium Valved Rear Section Exhaust for F80 M3 & F82/F83 M4 (S55) – OEM Switchable Valvetronic Axle-Back Back Box/Muffler with Quad Tailpipes – Titanium or Carbon Fibre Tips

BMW M Division Titanium Valve-Controlled Rear Section for F80 M3 and F82 F83 M4

Turn up the character of your S55 twin turbo straight six with the official OE BMW M titanium rear section. This factory upgrade replaces the standard back box with a lightweight valve-controlled silencer and quad outlets, delivering a richer, motorsport tone, sharper throttle acoustics and a serious weight reduction. Choose between polished titanium finishers or carbon fibre tailpipe trims for the perfect OEM plus look.

Key reasons enthusiasts choose this OE titanium rear box

• Authentic BMW M part for F80 M3 saloon, F82 M4 coupé and F83 M4 convertible, including CS and GTS variants.
• Titanium construction for low mass and heat resistance, with lightweight steel front pipework as per BMW specification.
• Active flap control integrated with drive modes:
  • Sport and Sport Plus, louder and more aggressive with crackle on overrun.
  • Efficient, deeper than stock with refined cabin comfort.
• Approximate 32 percent reduction versus the standard unit, around 8 kg saving.
• Perforated internal tubes and precision engineered canister for that signature M timbre.
• Quad exit look with M logo tips, available in carbon fibre or titanium.
• CAD and FEM developed by BMW engineers for durability, thermal stability and fitment accuracy.
• Bolt-on install using supplied clamps, no welding required.

We run this system on our own builds and have fitted it for many customers. Feedback is consistently positive, with owners praising the quality, refined drivability and the more purposeful soundtrack under load. If you want a premium OE upgrade that keeps the car’s integrity intact while unlocking the S55 character, this is the one.

Tailpipe finishers

• 80 mm twin outlets per side in titanium with M logo.
• Optional 93 mm carbon fibre finishers with M logo for a bolder appearance.

What you get

• Valve-operated silencer assembly with connecting pipework.
• Set of four tip finishers in your chosen material:
  • Titanium tip set, or
  • Carbon fibre tip set.
• Mounting hardware and clamps supplied by BMW.

Additional items recommended for installation

• 2 x Genuine BMW S55 downpipe gasket, exhaust side.
• 4 x Genuine BMW catalytic exhaust centre collar nut, M8.

Vehicle compatibility

• BMW M3 F80 saloon.
• BMW M4 F82 coupé, including CS and GTS.
• BMW M4 F83 convertible.

Fitment check: We verify compatibility before dispatch. Add your UK registration or last 7 of VIN at checkout.

Part numbers

• 18302349921 – Silencer system without tailpipes.
• 18302358111 – Titanium tailpipes.
• 18302358110 – Carbon tailpipes.

Professional fitting and support

Installation and setup available at MJ Modifications in Warwickshire. For a tailored supply and fit quote, email info@mjmodifications.co.uk. We also offer guidance on pairing with mid section options while keeping drone to a minimum.

Manufactured by

BMW, Genuine BMW M Performance Parts.

Warranty

Two year manufacturer warranty for UK customers and one year for international customers when a compatible VIN is provided at checkout.

Sound clips and examples

BMW F80 M3 system with carbon tip finishers

Example paired with an equal length mid pipe on F80 F82

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