Milltek ValveSonic+ Valved Cat-Back Exhaust for BMW M140i 1 Series (F20/F21 LCI, 2015+) | B58 Performance/Sports Catback, Switchable Valves, T304 Stainless, UK Made | Fits 3-Door & 5-Door Hatchback

Milltek valve-controlled cat back system for BMW 1 Series M140i F20 F21 LCI - 2015 onward

Give your B58-powered M140i the soundtrack and flow it deserves with this premium UK-built stainless performance system. Purpose designed for the facelift 1 Series hot hatch, this rear system brings switchable volume control, freer breathing pipework and a refined, motorsport-inspired tone that stays civil on the commute yet comes alive when you want it to. Ideal for drivers searching for a BMW M140i sports exhaust upgrade that blends quality, sound and fitment.

Key benefits

• Tailored for BMW M140i F20 and F21 LCI models from 2015, three door and five door
• Active valve control for quiet cruising or an aggressive soundtrack on demand
• Constructed from austenitic 304 grade stainless for longevity and corrosion resistance
• Mandrel-formed tubing for smooth, consistent radii and improved gas flow
• Carefully optimised pipe diameter for performance without sacrificing mid-range torque
• Tuned acoustics with minimal cabin boom for comfortable daily use
• Designed, developed and finished in Britain with precise OE-level fit

Why this system suits the M140i

The 1 Series M140i responds brilliantly to a quality cat back. This system enhances throttle response and character while keeping intrusive resonance in check. Using high quality 304 stainless throughout the silencers and pipework ensures durability, a clean appearance over time and a consistent tone. Meticulous development means excellent alignment with factory hangers and a hassle free install.

Our experience

We have fitted this setup to multiple customer cars at MJ Modifications and feedback has been outstanding. Owners love the switchable volume, the crisp note under load and the calm manners on motorway journeys. It feels like the perfect balance for a fast road M140i that you can enjoy every day.

Compatibility

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

Fitting and support

Professional installation available at MJ Modifications in Warwickshire. For a fitting quote or advice, email info@mjmodifications.co.uk.

Popular search terms

BMW M140i sports exhaust, BMW 1 Series M140i performance system, B58 M140i cat back, M140i valve controlled exhaust, stainless M140i exhaust system, BMW M140i rear system upgrade, F20 F21 M140i hatchback exhaust, M140i sound upgrade, anti drone M140i exhaust, UK made M140i exhaust, BMW hot hatch exhaust, performance muffler M140i, switchable volume exhaust M140i, BMW 1 Series M140i stainless system, M140i exhaust tone upgrade.