Milltek Sport Rear Silencer/Muffler Back Box Axle-Back Exhaust for BMW M135i 1 Series F20/F21 (2012+) 3 & 5 Door – T304 Stainless Tailbox Upgrade with Black Ceramic-Coated (Cerakote) Tailpipes

BMW M135i F20 F21 Rear Section Exhaust with Satin Black Cerakote Tailpipes by Milltek Sport

Give your M135i the soundtrack it deserves. This UK-crafted Milltek Sport rear section exhaust transforms the tone of the BMW 1 Series hot hatch with a deeper, richer note that stays civilised on long journeys. Built from aerospace-grade T304 stainless steel and finished with stealthy satin black Cerakote-coated tailpipes, it combines premium materials with precise fit and long-term durability.

Engineered as an axle-back rear muffler upgrade for the F20 and F21 chassis, it uses smooth-radius mandrel bends and enlarged pipework to reduce restriction and enhance gas flow. The result is a crisper, more engaging sound under throttle without the unwanted cabin boom or drone that can spoil daily driving. If you want a tasteful acoustic uplift and a stealth look, this rear box is the perfect match for the M135i.

Why enthusiasts choose this Milltek rear section

• Refined performance tone with no intrusive cabin resonance
• Hand finished in the UK from high-grade T304 stainless for corrosion resistance
• Free-flowing, mandrel-bent pipework for responsive, engaging driveability
• Satin black Cerakote tailpipes for a discreet, premium appearance
• Direct-fit axle section that uses factory mounting points for a clean install
• Designed specifically for the BMW M135i F20 5-door and F21 3-door, 2012 onwards

Fitment

Compatible with BMW M135i 1 Series F20 5-door and F21 3-door models from 2012 onwards. Axle-back rear section with black ceramic-coated outlets.

Installation

Straightforward bolt-on replacement. For professional fitting, book with MJ Modifications in Warwickshire. Request a quote at info@mjmodifications.co.uk.

Tried and trusted by us

We have fitted this Milltek rear section to multiple customer M135i cars and feedback has been consistently excellent. Owners love the tasteful sound upgrade, the quality of the stainless construction and the stealth look of the Cerakote satin black tips.

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