Genuine BMW M Performance Rear Silencer/Muffler Back Box Axle-Back Exhaust for N55 F22 F23 F30 F31 F32 F33 F36 (M235i 2012-2016, 335i 2012-2014, 435i 2012-2014, Auto 02TB) Stainless Steel, Without Tailpipes - OEM 18302354340

OEM+ rear box upgrade for BMW N55 F-series | Part no. 18302354340

Give your turbo straight six the voice it deserves with this factory performance rear section. This genuine BMW sports rear box transforms the soundtrack with a deeper, richer note while keeping motorway manners civil. Built in corrosion resistant stainless steel and engineered to BMW’s exacting standards, it is the perfect OE-quality axle back solution for enthusiasts who want authentic sound and reliability in one package. Tailpipe trims are not included.

Key benefits

• Authentic BMW performance part for the N55-powered F-series platform
• Stainless construction for long life in UK conditions
• Optimised internal flow for reduced back pressure and improved response
• Deeper, more characterful tone without intrusive cabin drone
• Computer-optimised design for precise fit and factory finish
• Axle back rear section supplied without tailpipe tips so you can choose your preferred finish

Vehicle suitability

• 2 Series F22 F23 M235i and M235i xDrive 2012 to 2016
• 3 Series F30 saloon and F31 touring 335i and 335i xDrive 2012 to 2014
• 4 Series F32 coupé, F33 cabriolet, F36 Gran Coupé 435i and 435i xDrive 2012 to 2014 automatic only

For cars with Sport Automatic transmission option 02TB. If you have an M235i or M235i xDrive, please send your VIN so we can confirm the correct application before purchase.

Part number

18302354340

What you will notice

• A more engaging exhaust note that highlights the N55’s inline six character
• Smoother throttle pick up thanks to less restriction in the rear section
• Premium OEM fitment that integrates with factory hangers and clamps
• Quality materials that resist rust and heat cycling

Compatibility check before dispatch

We verify fitment prior to shipping. Provide your UK registration or the last seven digits of your VIN at checkout so we can confirm the correct part for your car.

Installation and support

Professional fitting is recommended. MJ Modifications in Warwickshire can install this rear section and supply suitable tailpipe trims if required. For a quote or to book, email info@mjmodifications.co.uk.

Manufacturer and warranty

Manufactured by BMW as an original performance upgrade. Warranty coverage is 2 years for UK customers and 1 year for international orders when a valid VIN is provided and fitment is confirmed.

Proven by us and our customers

We have installed this rear box on our own builds and for many clients. Feedback is consistently positive, praising the refined yet sporty tone and the confidence of genuine BMW hardware.

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