Milltek Sport Resonated Cat-Back/Catback Exhaust, 90mm Carbon Fibre Tips for BMW M140i F20/F21 LCI 2015+ (1 Series 3 & 5 Door, B58) – T304 Stainless Steel Performance/Sports Rear System, Low Drone, UK Made

Give your BMW 1 Series hot hatch the soundtrack and refinement it deserves with this Milltek performance rear system. Designed for the facelift BMW M140i F20 and F21 from 2015 onward, this silenced cat back setup brings a richer, deeper tone on throttle while keeping motorway cruising calm and comfortable. Precision built in the UK from premium T304 austenitic stainless steel, it blends everyday civility with a purposeful, enthusiast-pleasing note and a high quality finish featuring 90 mm carbon-finish Jet style tips that fill the bumper beautifully.

Key reasons enthusiasts choose this upgrade

• Silenced centre section controls cabin boom for an enjoyable commute and long distance driving
• 90 mm carbon look tailpipe ends give a motorsport inspired, OEM plus appearance
• UK crafted from T304 stainless for durability, corrosion resistance and long term value
• Smooth radius, mandrel formed tubing promotes efficient gas velocity and crisp throttle response
• Optimised pipe diameter helps maintain mid range punch while enhancing overall character
• Direct fit rear system that leaves factory emissions hardware untouched
• Engineered to start every time, fit first time and perform consistently

How it sounds and drives

Expect a deeper, sportier soundtrack under load without unwanted drone in the cabin. Around town it stays civilised, and on the motorway it settles into a comfortable hum. Open it up and you get that unmistakable Milltek tone that makes the M140i feel more special without being over the top.

Fitment

• BMW M140i F20 LCI 3 door - 2015 onward
• BMW M140i F21 LCI 5 door - 2015 onward

This is a cat back configuration that bolts to the factory connection point and retains the original catalytic converter and associated sensors.

Built to last

Each system is jig assembled, TIG welded and finished to a high standard for a precise fit and a long service life. T304 austenitic stainless resists rust and discolouration, and the carbon-finish Jet tips deliver a premium look that complements the rear valance on both 3 door and 5 door models.

Tested by us. Loved by our customers

We have fitted and run this setup on customer cars and our own. Feedback is consistent – superb fitment, a tasteful step up in volume, and a quality tone that keeps daily driving enjoyable. It is the ideal balance for owners who want a performance sound without sacrificing comfort.

Professional installation and support

We recommend fitting at MJ Modifications in Warwickshire for the best results. For quotations, workshop availability and advice on suitability or sound levels, please email info@mjmodifications.co.uk.

Helpful search terms

BMW M140i performance exhaust system, BMW 1 Series M140i F20 F21 LCI sports exhaust UK, stainless cat back for M140i, Milltek M140i stainless system, M140i 90mm carbon tips exhaust, T304 stainless rear section BMW M140i, BMW M140i F20 facelift exhaust upgrade, BMW 1 Series M140i UK made exhaust, quiet cruising low drone exhaust M140i, BMW M140i performance rear system, BMW M140i 3 door 5 door exhaust, Milltek carbon tip outlets M140i.