Milltek Sport Race Rear Silencer Backbox Axle-Back Exhaust for BMW 1 Series M135i F20/F21 (2012-on) – T304 Stainless with Titanium Twin Tips, 3 & 5 Door, UK Made

Transform the soundtrack of your BMW 1 Series M135i

Unlock a sharper, more purposeful tone and a cleaner aesthetic at the rear with this UK-built sports rear box for the BMW 1 Series M135i. Featuring premium titanium tail trims and precision T304 stainless construction, this axle section brings a motorsport-inspired note while keeping day-to-day usability intact.

Key highlights

• Designed for BMW 1 Series M135i F20 5-door and F21 3-door, 2012 onwards
• T304 non-magnetic stainless steel for durability and corrosion resistance
• Constant-radius bends for smooth flow and crisp throttle response
• Race-style rear box for a more assertive, engaging exhaust character
• Titanium tailpipes deliver a lightweight, high-end finish at the rear
• Sound-developed to minimise drone and cabin boom

Why enthusiasts choose this upgrade

This rear section is a favourite among our customers looking for a cleaner, deeper tone and a more exciting drive without compromising everyday comfort. The combination of quality materials, precision pipework and titanium tips provides a premium look and feel, with the reliability you expect from a leading UK exhaust specialist.

Compatibility

• BMW 1 Series M135i F20 5-door, 2012 on
• BMW 1 Series M135i F21 3-door, 2012 on

Our experience

We have supplied and fitted this system for many M135i owners and feedback has been consistently positive. The tone is fuller, the car feels more alive, and the titanium tail trims elevate the rear end styling.

Professional fitting

Want it installed by specialists? Book fitting with MJ Modifications in Warwickshire. For a quote, email info@mjmodifications.co.uk.

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