Milltek Sport BMW 1 Series M140i Cat-Back/Catback Exhaust F20/F21 LCI (2015+) – Resonated (Centre Silenced) Performance Rear System/Back Box, GT90/GT-90 Polished Tips, T304 Stainless Steel, B58, UK Made, No Drone, 3 & 5 Door

Milltek Sport Performance Exhaust System for BMW 1 Series M140i F20 F21 LCI 2015 onwards

Transform the soundtrack and look of your BMW 1 Series hot hatch with this Milltek Sport rear system for the facelift M140i. Built in the UK from premium 304-grade austenitic stainless steel, this upgrade delivers a deeper, richer tone with superb refinement at motorway speeds and a sharper growl when you press on. The mirror-finish GT90 tailpipes complete the rear end with an OE-plus appearance that looks right at home on the B58-powered 1 Series.

Designed to fit the 2015 onward facelift F20 and F21 3-door and 5-door models, this system runs from the catalyst back with a centre silencer for a refined drive. Constant-radius bends and optimised pipe sizing promote smooth gas flow for excellent response without cabin boom. It is a direct replacement for the factory rear section with precise, jig-built fitment and robust, UK-engineered hardware.

Key reasons enthusiasts choose this Milltek Sport system

• Refined at cruise and purposeful under load with no intrusive cabin boom
• Large GT90 polished tailpipes for a clean, factory-plus finish
• 304 stainless construction for long-term corrosion resistance
• High-flow, constant-radius pipework for smooth exhaust gas velocity
• Direct bolt-on replacement that mates to the OEM catalyst outlet
• Engineered and finished in the UK by Milltek Sport

Fitment details

Compatible with BMW M140i facelift models, chassis codes F20 and F21, 2015 onwards, 3-door and 5-door. This is the section from the catalytic converter rearwards and is built specifically for the M140i platform with the B58 engine.

What our customers say

We have installed this system on multiple M140i cars and the feedback is consistently positive. Owners love the deeper tone, the lack of drone on long journeys, and the smart GT90 finishers that elevate the rear styling without looking over the top.

Professional fitting

Want it fitted properly the first time? Book installation with MJ Modifications in Warwickshire. Request a quote at info@mjmodifications.co.uk.

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