Milltek Sport Rear Exhaust OPF/GPF-Back (PPF-Back) for BMW M135i xDrive F40 2019-on – Axle-Back/Backbox/Silencer Upgrade, T304 Stainless, GT-115 Ceramic Black Tips, UK-Made Performance for 1 Series 5-Door Hatchback

Rear Section Performance Exhaust with Black Ceramic GT-115 Tips for BMW 1 Series M135i xDrive F40 2019 onwards

Upgrade the soundtrack and rear-end styling of your BMW 1 Series M135i xDrive F40 with this UK-built rear system from Milltek. Crafted from premium T304 stainless steel and designed to install after the petrol particulate filters, it delivers a fuller, sportier tone on throttle while remaining civilised on the motorway. The stealthy black ceramic GT-115 tailpipe finishers complete the factory-plus look on your 5 door hot hatch.

Engineered for smooth airflow using constant-radius bends and increased diameter tubing, this direct-fit setup sharpens response feel and resists corrosion in all conditions. It bolts to the original mounting points, retains the PPF hardware, and adds a deeper character without unwanted boom in the cabin.

Why enthusiasts choose this upgrade

• Purpose-built for BMW M135i xDrive F40 2019 onwards with petrol particulate filter
• PPF-back layout replaces the rear section after the factory filters for easy installation
• GT-115 black ceramic coated tips for a subtle, motorsport-inspired finish
• T304 austenitic stainless steel for long-term durability and corrosion resistance
• Constant-radius, mandrel-formed bends for smooth gas flow and a richer tone
• Increased diameter pipework over stock to support performance potential
• Refined sound development for everyday usability with no intrusive cabin boom
• Designed and built in Britain by a leading exhaust manufacturer

Real-world results

We have fitted this system to customer cars at MJ Modifications and the feedback has been consistently positive. Owners love the deeper exhaust note, the premium fit and finish, and the smart black ceramic finishers that look right at home on the M135i xDrive.

Fitment and installation

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

Vehicle compatibility

Compatible with BMW M135i xDrive F40 5 door models from 2019 onward equipped with a petrol particulate filter. If you are unsure whether your car is PPF equipped, get in touch and we will help you confirm.

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