Milltek OPF/GPF-Back Performance Exhaust System with GT-115 Polished Trims for BMW M135i xDrive F40 5 Door (2019-on, OPF/GPF Equipped) Stainless Steel, UK Made

Filter-Back Rear Section with 115 mm Mirror-Polish Tailpipes for BMW M135i xDrive F40 5 Door 2019 onwards

Give your M135i xDrive the soundtrack it deserves. This UK built rear section from Milltek transforms the character of the BMW F40 hot hatch with a richer, deeper tone, crisper upshifts and a premium look thanks to the 115 mm mirror polished tailpipe ends. It keeps the factory petrol particulate filter in place for road friendly manners while unlocking that authentic performance growl enthusiasts want.

Engineered in Britain from high grade T304 stainless steel, the system uses smooth radius, constant diameter tubing to encourage freer flow and long term durability. It is a direct fit to OPF or GPF equipped cars, slots neatly onto the stock mounting points and is designed for everyday refinement with no annoying cabin buzz at motorway speeds.

Why enthusiasts choose this upgrade

• Filter-back rear section for BMW M135i xDrive F40 5 door 2019 onwards OPF or GPF models
• 115 mm mirror finish tailpipes for a clean, OEM plus appearance
• T304 grade stainless construction for corrosion resistance and longevity
• Smooth mandrel formed tubing supports efficient gas flow and response
• Purpose tuned soundtrack that is sporty on throttle and civilised on cruise
• Precision fitment that uses factory style hangers and clamps
• Designed and assembled in the UK by a leading performance exhaust specialist

Fitment

Compatible with BMW M135i xDrive F40 5 door hatchback from 2019 onwards with factory OPF or GPF. Direct swap rear section that retains the petrol particulate filter. No software or mapping required.

Sound and driveability

Expect a fuller, more mature note with an engaging crackle on gear changes yet minimal cabin intrusion on long journeys. The careful acoustic tuning targets unwanted frequencies to reduce drone while letting the B48 turbo four sound more purposeful.

Built to last

Using non magnetic T304 stainless steel, robust welds and high quality clamps, this system is made to handle UK road salt and daily use. The finish on the 115 mm tips lifts the rear of the car with a premium, motorsport inspired look.

What our customers say

We have supplied and fitted this system for multiple M135i owners and feedback has been consistently positive. Drivers love the sharper tone, the refined manners on the motorway and the head turning presence of the 115 mm polished ends.

Installation and support

Professional fitting recommended. MJ Modifications in Warwickshire can install this system and provide aftercare. Request a fitting quote at info@mjmodifications.co.uk.

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