Milltek Sport BMW G8X M3/M4 - Axle Back System with GT-115 Polished Trims - ECE Approved

The quickest way to make a G8X M3 or M4 sound the way it should. Milltek's axle-back replaces the factory rear section with a valved system that works with BMW's active exhaust, so it's quiet when cruising and properly purposeful when you open it up. It's ECE approved and road legal in the UK and Europe.

Specification

• Fits BMW M3 G80 and G81 Touring (2020 on) and M4 G82 (2020 on), OPF/GPF and non-OPF
• Electronically controlled valves that integrate with the car's active exhaust
• 80mm pipework with polished GT-115 round tips
• ECE approved (approval M3M4G8X)
• 304L aircraft-grade stainless steel, made in the UK
• Fitting time around 1.5–2 hours. Milltek part number: SSXBM1169

Going further

For more volume, Milltek's OPF-back system with centre resonator bypass adds to the sound. To finish the car, see our KW V3 coilovers and AIRTEC front-mount induction kit.

Fitting at String Theory Garage

We can fit this in our own workshop and check everything over before the car goes back to you. Get in touch when you order and we'll book a slot. See our workshop services for what else we do.

Questions we get asked

Does it work with the exhaust button?
Yes. The valves are designed to integrate with BMW's active exhaust system.

Does it fit the Touring and xDrive?
Milltek confirms it fits the full G8X family, including the M3 Touring and xDrive models.