Milltek Axle Back Exhaust for BMW 5 Series M5 4.4l Twin Turbo Hybrid G90 & G99 (UK/European Spec Vehicles) (2025 onwards) – Sportier Note, Simple Fitment
This is Milltek's axle-back exhaust for the BMW 5 Series M5 4.4l Twin Turbo Hybrid G90 & G99 (UK/European Spec Vehicles). 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 4 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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Tip Style: 115 GT
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EC Approved: Yes
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Race System: No
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 4 tailpipe finishes: GT-115 Brushed Titanium, GT-115 Burnt Titanium, GT-115 Cerakote Black, GT-115 Polished
- EC approved
- Designed, developed and manufactured in the UK by Milltek Sport
Fitment
- BMW 5 Series M5 4.4l Twin Turbo Hybrid G90 & G99 (UK/European Spec Vehicles) (2025 onwards)
Not suitable for: the BMW 5 Series M5 4.4l Twin Turbo Hybrid G90 & G99 (NAS/ROW Spec Vehicles), which needs the Milltek Axle Back Exhaust BMW 5 Series M5 4.4l Twin Turbo Hybrid G90 & G99 NAS & ROW Spec Vehicles 25+; the BMW 5 Series M5 & M5 Competition 4.4l Twin Turbo F90 (Non OPF/GPF Cars), which needs the Milltek Axle Back Exhaust BMW 5 Series M5 & M5 Comp 4.4l Twin Turbo F90 Non OPF/GPF Cars 18-20.
Installation
Some versions: With GT-115 Brushed Titanium Tips - OE requires cutting - ECE Approved. Some versions: With GT-115 Burnt/Blue Titanium Tips - OE requires cutting - ECE Approved. Some versions: With GT-115 Cerakote Black Tips - OE requires cutting - ECE Approved. Some versions: With GT-115 Polished Tips - OE requires cutting - ECE Approved. 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 GPF/OPF Bypass BMW 5 Series M5 4.4l Twin Turbo Hybrid G90 & G99 UK & European Spec Vehicles 25+.
Which tailpipe finishes are available?
You can choose from: GT-115 Brushed Titanium, GT-115 Burnt Titanium, GT-115 Cerakote Black, GT-115 Polished. The finish is cosmetic and does not change the sound.
Does it fit the BMW 5 Series M5 4.4l Twin Turbo Hybrid G90 & G99 (NAS/ROW Spec Vehicles)?
No. For that car, choose the Milltek Axle Back Exhaust BMW 5 Series M5 4.4l Twin Turbo Hybrid G90 & G99 NAS & ROW Spec Vehicles 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.
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.
