BMW
Genuine BMW M Performance Axle-Back Rear Silencer/Muffler Back Box/Tailbox Sport Exhaust for 1 Series F20 F21 M135i & M135i xDrive (M135iX) N55 – OEM Rear Section, No Tips – 18302349989
Genuine BMW M Performance Axle-Back Rear Silencer/Muffler Back Box/Tailbox Sport Exhaust for 1 Series F20 F21 M135i & M135i xDrive (M135iX) N55 – OEM Rear Section, No Tips – 18302349989
Heads-up on cancellations & returns: if you cancel an order or return an item, you won't get back 100% of what you paid. We apply a 10% restocking fee, the outbound shipping is non-refundable, and we have to pass on Shopify / PayPal payment processing fees; these aren't returned to us when we refund you. International orders also lose on exchange-rate spread in both directions. If the original packaging is damaged or missing, a reboxing charge applies. For international orders specifically, if you refuse to pay our shipping invoice or supply a prepaid label after placing the order, the same deductions apply. We're upfront about this — please be sure of your purchase before ordering.
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Authentic BMW M Performance Rear Section for 1 Series M135i N55 – Axle‑Back Tail Silencer
Give your turbocharged straight six the voice it deserves. This authentic BMW M Performance rear section transforms the soundtrack of the N55-powered 1 Series while keeping everyday refinement intact. It is the genuine axle-back tail silencer designed for the F20 and F21 M135i, including xDrive, delivering a richer tone, sharper character and perfect original-equipment fit.
We have fitted this unit many times in our own workshop and customer feedback has been outstanding. Expect a deeper, motorsport-inspired note outside the car with minimal cabin boom on the motorway, plus the reliability and longevity you only get from an OEM BMW performance part.
Why enthusiasts choose this upgrade
- Authentic BMW performance rear section for the N55 straight six
- Deeper, more characterful tone without intrusive drone
- Optimised flow helps the engine breathe more freely
- High grade stainless steel for durability and corrosion resistance
- Precision OE tolerances for a direct swap with factory hangers and mounts
- Axle-back layout for easy installation and reversible originality
What you receive
Rear silencer assembly only. Tailpipe finishers are not included. Genuine BMW carbon or chrome tips can be purchased separately for a premium factory look.
Compatibility
- BMW 1 Series F20 M135i – N55 six-cylinder
- BMW 1 Series F21 M135i – N55 six-cylinder
- Includes xDrive and M135iX all-wheel drive variants
If you are unsure, we will verify fitment before dispatch. Provide your UK registration or the last 7 characters of your VIN at checkout.
Part number
18302349989
Manufactured by
BMW M Performance – Genuine BMW Parts
Fitting and installation
Professional installation is recommended. MJ Modifications in Warwickshire offers full fitting services and setup. Request a quote at info@mjmodifications.co.uk.
Warranty
Two-year manufacturer warranty for UK customers and one-year manufacturer warranty for international customers when a compatible VIN is supplied.
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The MJ Modifications difference
- We have installed this rear section on multiple customer cars with consistently positive results
- Honest advice, proven fitment and aftercare from a specialist who knows the platform
- Optional pairing with genuine BMW tailpipe finishers for a complete OEM+ look
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