Milltek Axle Back Exhaust for BMW 3 Series G80 M3 & M3 Competition S58 3.0 Turbo (North American/ROW Non-OPF/GPF Cars Only) (2021 onwards) – Sportier Note, Simple Fitment
This is Milltek's axle-back exhaust for the BMW 3 Series G80/G81 M3 & M3 Competition S58 3.0 Turbo (OPF/GPF Equipped Cars Only) inc Touring & XDrive Models. It replaces the exhaust from the rear axle back, the shortest section Milltek offers on this platform, swapping the factory tail section for wider-bore pipework and a silencer tuned for a sportier note. Everything ahead of the rear axle, including the mid-pipe, stays standard. It's offered in 5 tailpipe finishes, so you can pick the setup that suits how the car's used.
It's the option for a subtle, tail-end-only change in sound and look, rather than the fuller transformation of a cat-back or front-pipe-back system.
Specifications
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System Type: Axle Back
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Pipe Diameter: 80mm (3.15")
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EC Approved: Yes
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Race System: No
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Fitting Time: approx. 1.5 to 2 hours (Milltek figure)
Key Features
- Made from T304L aircraft-grade stainless steel, which is anti-magnetic and resists discolouration
- Mandrel-bent pipework keeps a constant diameter through every bend for unrestricted flow
- 80mm (3.15") pipework
- Replaces the rear section only; everything ahead of the rear axle stays standard
- Choice of 5 tailpipe finishes: GT-115 Brushed Titanium, GT-115 Burnt Titanium, GT-115 Cerakote Black, GT-115 Polished, JET-115 Carbon Fibre
- EC approved
- Designed, developed and manufactured in the UK by Milltek Sport
Fitment
- BMW 3 Series G80 M3 & M3 Competition S58 3.0 Turbo (North American/ROW Non-OPF/GPF Cars Only) (2021 onwards)
- BMW 3 Series G80/G81 M3 & M3 Competition S58 3.0 Turbo (OPF/GPF Equipped Cars Only) inc Touring & XDrive Models (2020 onwards)
- BMW 4 Series G82 M4 & M4 Competition S58 3.0 Turbo (North American/ROW Non-OPF/GPF Cars Only) (2021 onwards)
- BMW 4 Series G82 M4 & M4 Competition S58 3.0 Turbo (OPF/GPF Equipped Cars Only) (2020 onwards)
Not suitable for: the BMW 3 Series G20 & G21 M340i XDrive Saloon & Touring Models (OPF/GPF Models Only) Pre LCI, which needs the Milltek Filter-back Exhaust BMW 3 Series G20 G21 M340i XDrive Saloon Touring OPF/GPF Pre LCI 19-25.
Installation
Milltek quotes a fitting time of approx. 1.5 to 2 hours. Some versions: Axle Back System with GT-115 Brushed Titanium Trims - ECE Approved (OE Requires Cutting). Some versions: Axle Back System with GT-115 Burnt Titanium Trims - ECE Approved (OE Requires Cutting). Some versions: Axle Back System with GT-115 Cerakote Black Trims - ECE Approved (OE Requires Cutting). Some versions: Axle Back System with GT-115 Polished Trims - ECE Approved (OE Requires Cutting). We recommend professional fitting on a ramp. Once fitted, check the tailpipe alignment and re-check all clamps after the first few hundred miles.
Upgrade Further
Also available from Milltek for this car: Milltek Secondary Catalyst Bypass BMW 3 Series G80 M3 & M3 Comp S58 3.0 Turbo (North American & ROW Non-OPF/GPF Cars Only) 21+, Milltek GPF/OPF Bypass BMW 3 Series G80 & G81 M3 & M3 Comp S58 3.0 Turbo OPF/GPF inc Touring & XDrive 20+.
Which tailpipe finishes are available?
You can choose from: GT-115 Brushed Titanium, GT-115 Burnt Titanium, GT-115 Cerakote Black, GT-115 Polished, JET-115 Carbon Fibre. The finish is cosmetic and does not change the sound.
Will it fit the BMW 3 Series G80/G81 M3 & M3 Competition S58 3.0 Turbo (OPF/GPF Equipped Cars Only) inc Touring & XDrive Models?
Yes. Milltek lists this part for the BMW 3 Series G80/G81 M3 & M3 Competition S58 3.0 Turbo (OPF/GPF Equipped Cars Only) inc Touring & XDrive Models as well as the other models in the fitment list above.
Does it fit the BMW 3 Series G20 & G21 M340i XDrive Saloon & Touring Models (OPF/GPF Models Only) Pre LCI?
No. For that car, choose the Milltek Filter-back Exhaust BMW 3 Series G20 G21 M340i XDrive Saloon Touring OPF/GPF Pre LCI 19-25.
Is it road legal?
Every version of this part is listed by Milltek as EC approved.
Do I need a remap?
No. It fits behind the factory catalytic converter, so no software changes are needed.
How long does it take to fit?
Milltek quotes approx. 1.5 to 2 hours.
What is it made from?
T304L aircraft-grade stainless steel, which is anti-magnetic and resists discolouration better than lower grades.
Is there a warranty?
Yes. Milltek products are covered against defects in materials and workmanship. Contact us with your order number if you have a problem.
