Milltek Sport Cat-Back Race (Non-Resonated) Exhaust for BMW M135i 1 Series F20 F21 2012+ 3 & 5 Door - Polished Twin Tips - 304 Stainless Steel Performance/Sports Catback System, Mandrel Bent, UK Made

Milltek Sport Cat Back System with Polished Tailpipe Trims for BMW M135i F20 F21

Give your BMW 1 Series M135i the soundtrack and build quality it deserves with this British-made Milltek Sport cat back system. Engineered for the F20 5 door and F21 3 door models from 2012 onward, this stainless steel upgrade delivers a louder, motorsport-inspired tone, freer breathing pipework and a premium mirror-finish tailpipe look that suits the M135i perfectly.

Key reasons enthusiasts choose this system

• UK designed, developed and hand finished for consistent fit and long-term reliability.
• Type 304 non-magnetic stainless steel used throughout the system for durability and resistance to tarnishing.
• CNC mandrel bends maintain a constant internal diameter for smooth gas flow and improved throttle response.
• Carefully increased tubing size over factory for performance gains without sacrificing mid-range drivability.
• Acoustically refined for a sharp, engaging note without intrusive cabin drone on the motorway.
• Polished twin tailpipes provide an OEM plus appearance that complements the rear bumper.

Compatibility

• Vehicle: BMW M135i 1 Series F20 5 door and F21 3 door.
• Years: 2012 onwards.
• Configuration: Cat back race style with polished tailpipe finish.

What it feels like on the road

Expect a crisper, more characterful exhaust note and a livelier feel through the rev range. The smooth, mandrel-bent design helps the turbocharged six breathe more freely, enhancing response while retaining everyday refinement. It is the ideal M135i upgrade if you want a stronger soundtrack without unwanted resonance.

Tried and recommended by us

At MJ Modifications we have installed this Milltek system on multiple customer cars. Fitment has been spot on, the finish is superb and owner feedback is consistently positive about the sound quality and overall driving experience.

Professional fitting

We offer installation at MJ Modifications in Warwickshire. For a fitting quote, email info@mjmodifications.co.uk.

Search-friendly terms customers use

BMW M135i F20 F21 exhaust system, 1 Series M135i sports exhaust, Milltek Sport M135i system, cat back exhaust M135i, stainless steel M135i upgrade, BMW 1 Series performance exhaust, M135i race sound exhaust, polished tailpipe trims M135i, UK made BMW M135i exhaust, BMW 1 Series 2012 2013 2014 2015 2016 exhaust upgrade, hot hatch exhaust M135i, enlarged bore exhaust M135i, mandrel bent M135i system, non magnetic stainless exhaust BMW, performance rear section M135i, louder exhaust for M135i, F20 M135i exhaust 5 door, F21 M135i exhaust 3 door.