Milltek Sport Axle-Back Exhaust Rear Silencer/Back Box/Rear Muffler for BMW 1 Series M135i F20/F21 Hatch (2012-On, 3dr/5dr) – Mirror Polished Tips – T304 Stainless Performance Rear Section UK-Made

Milltek Sport rear section with mirror polished tailpipes for BMW 1 Series M135i F20 F21 2012 onwards

Give your BMW 1 Series M135i a sharper soundtrack and a smarter finish with this Milltek Sport rear section. Built in the UK from T304 aircraft-grade stainless steel, this high quality rear backbox replaces the factory rear unit to deliver a deeper, more engaging tone and long lasting durability. The mirror polished tailpipes complete the OE-plus look that M135i owners love.

Why this rear section is the go-to upgrade

• T304 stainless construction for strength and corrosion resistance in all UK weather conditions
• Mandrel bent pipework for smooth gas flow and consistent performance
• Precision welds and factory-style hangers for a neat, secure install
• Refined sound profile with a sporty edge and no intrusive cabin boom
• Polished tailpipe finishers that elevate the rear end styling

We have fitted this Milltek rear section to multiple customer cars in-house and the feedback is consistently positive. Owners praise the improved tone, the premium fit and finish and the quality of the polished tips. It is a brilliant upgrade for daily driving and weekend blasts alike.

Compatibility

For BMW M135i hatchback F20 3dr and F21 5dr models from 2012 onwards, including pre-LCI and LCI. Designed specifically for the M135i platform and uses the original mounting points for a clean installation.

Ideal for searches such as

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What you can expect

• A richer, more purposeful exhaust note that complements the M135i character
• Premium materials that keep their finish and resist discolouration
• A tidy, integrated appearance with mirror polished tips

Professional fitting

Prefer expert installation and a seamless experience? Book your fitment with MJ Modifications in Warwickshire. Request a quote at info@mjmodifications.co.uk.

Upgrade your M135i with this UK engineered Milltek Sport rear section and enjoy a smarter look and a rewarding sound every time you drive.