Milltek Sport Performance OPF/GPF-Back Exhaust System for BMW M135i xDrive F40 (5 Door, 2019-On) with GT-115 Cerakote Black Tips | T304 Stainless Steel

BMW M135i F40 GPF-back Exhaust Upgrade with GT-115 Black Ceramic Tips by Milltek

Give your BMW 1 Series M135i xDrive the soundtrack and style it deserves. This Milltek particulate filter back system replaces the factory rear section after the GPF, unlocking a richer, more purposeful tone and a sharper look thanks to the stealth GT-115 ceramic-coated black outlets. Built in the UK from austenitic 304-grade stainless steel, it offers long-lasting corrosion resistance, precision fitment and a refined driving experience on the motorway and in town.

Reasons enthusiasts choose this system

• Deeper, sportier exhaust note with no unwanted cabin drone
• Optimised gas flow from mandrel-bent pipework for responsive performance feel
• Durable 304 stainless construction that resists discolouration and corrosion
• Stealth GT-115 ceramic-coated black tailpipes for a premium, motorsport-inspired finish
• Direct bolt-on fit to GPF-equipped M135i F40 using factory mounting points
• Engineered and hand finished in the UK by Milltek

What is included

A complete GPF-back Milltek Sport exhaust assembly in 304-grade stainless steel with free-flowing, constant-radius bends and GT-115 black ceramic coated trims. Designed to enhance the character of the B48-powered M135i while retaining everyday refinement.

Vehicle compatibility

• BMW M135i xDrive F40, 5-door hatchback
• 2019 onward models with OPF/GPF
• Right-hand drive and left-hand drive suitable

Real-world feedback

We have fitted this upgrade to customer M135i F40 cars and the response has been excellent. Owners love the richer tone on throttle, the clean, drone-free cruising, and the stealth look of the GT-115 black tips. It elevates the car’s character without compromising daily usability.

Fitting and support

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

Search-friendly terms customers use

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Milltek Part Number: included on your invoice when supplied or confirmed with your order. If you already have a specific Milltek code, add it to your notes and we will reference it.

Please note: this is a GPF-back system that retains the factory particulate filter while enhancing sound and flow from the filter back.