Milltek Sport OPF/GPF-Back Axle-Back Performance Exhaust for BMW 1 Series M135i xDrive AWD F40 5-Door (2019-2024) | Rear Section Back Box/Rear Silencer | GT-115 Titanium Tips | T304 Stainless Steel | UK Made

BMW 1 Series M135i xDrive F40 Rear Section Exhaust with GT-115 Titanium Tailpipe Finishers

Transform the sound and look of your 2019 onwards M135i xDrive with this UK-made rear section system. Crafted from high quality T304 grade stainless steel and finished with striking GT-115 titanium tailpipes, it brings a richer tone, sharper throttle response feel and a premium motorsport aesthetic to your hot hatch without sacrificing day-to-day refinement.

Highlights

• OPF and GPF friendly rear section layout that retains your factory particulate filters
• Premium T304 stainless steel construction for corrosion resistance and long service life
• Smooth, free-flowing mandrel-bent pipework for consistent gas velocity
• Engineered soundtrack with a deeper note and no unwanted cabin drone
• GT-115 titanium tailpipe trims for a lightweight, race-inspired finish
• Designed, developed and hand finished in the UK with a factory-style fit

Why owners choose this upgrade

Drivers tell us it is exactly what the F40 M135i needs: a more engaging tone on throttle, a refined cruise, and a rear end that looks special thanks to the titanium finishers. We have fitted this system on customer cars and our own demonstrators and the feedback has been consistently positive for sound quality, build, and fitment.

Build and sound

Using non-magnetic T304 stainless throughout the silencers and pipework, this rear section resists discolouration and harsh weather. Carefully optimised diameters and mandrel bends help the B48-powered M135i breathe more freely, while extensive acoustic development delivers a crisp, sporty voice without harshness or resonance on the motorway.

Compatibility

Fits BMW M135i xDrive F40 5 door models from 2019 onwards equipped with OPF/GPF.

Professional installation

Want it fitted right first time? Book professional installation with MJ Modifications in Warwickshire. Request a fitting quote: info@mjmodifications.co.uk

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