Milltek Axle Back Exhaust for BMW 5 Series M5 4.4l Twin Turbo Hybrid G90 & G99 (NAS/ROW 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 (NAS/ROW 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
-
System Type: Axle Back
-
Pipe Diameter: 80mm (3.15")
-
Tip Style: 115 GT
-
EC Approved: No
-
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
- Designed, developed and manufactured in the UK by Milltek Sport
Fitment
- BMW 5 Series M5 4.4l Twin Turbo Hybrid G90 & G99 (NAS/ROW Spec Vehicles) (2025 onwards)
Not suitable for: the BMW 5 Series M5 4.4l Twin Turbo Hybrid G90 & G99 (UK/European Spec Vehicles), which needs the Milltek Axle Back Exhaust BMW 5 Series M5 4.4l Twin Turbo Hybrid G90 & G99 UK & European 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 and included Valves & Controller. Some versions: With GT-115 Burnt/Blue Titanium Tips - OE requires cutting and included Valves & Controller. Some versions: With GT-115 Cerakote Black Tips - OE requires cutting and included Valves & Controller. Some versions: With GT-115 Polished Tips - OE requires cutting and included Valves & Controller. 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 5 Series M5 4.4l Twin Turbo Hybrid G90 & G99 NAS & ROW 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 (UK/European Spec Vehicles)?
No. For that car, choose the Milltek Axle Back Exhaust BMW 5 Series M5 4.4l Twin Turbo Hybrid G90 & G99 UK & European Spec Vehicles 25+.
Is it road legal?
Milltek does not list EC approval for this part. Any exhaust used on the road must still meet noise and emissions rules, so check the requirements where you live.
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.
