Milltek Sport BMW G90 & G99 M5 Axle Back Exhaust System (NAS/ROW Spec Vehicles)

Enhance the sound, performance, and presence of your BMW G90 or G99 M5 with the Milltek Sport Axle-Back Exhaust System, designed exclusively for NAS/ROW specification vehicles. Engineered in the UK using over four decades of exhaust development expertise, this precision-crafted system transforms your M5’s character — delivering a deeper, more engaging exhaust tone and improved flow efficiency while maintaining OEM-quality fitment.

Constructed from premium 304L aircraft-grade stainless steel, this axle-back system offers exceptional durability, corrosion resistance, and long-term reliability. The enlarged 3.15” (80mm) pipework is designed to reduce back pressure and enhance throttle response, giving your S68 twin-turbo V8 a more pronounced and refined sound profile without excessive cabin drone.

Developed for enthusiasts who demand more from their M5, Milltek’s system seamlessly integrates with the factory layout, providing a clean, OE-style fit and finish. Available with a range of tailpipe designs to match your preferred aesthetic, this axle-back exhaust delivers the ideal combination of performance, tone, and craftsmanship that Milltek is globally renowned for.

(Cutting of the OE exhaust system is required during installation.)

Key Features

• Enhanced Performance: 3.15” (80mm) pipework optimises exhaust gas flow for sharper response and potential power gains.

• Refined Sound Profile: Produces a deeper, sportier tone while maintaining comfort for everyday driving.

• Premium Construction: Handcrafted from 304L aircraft-grade stainless steel for superior strength and corrosion resistance.

• Customisable Finish: Tailpipe options available to suit your preferred style.

• Precision Fitment: Designed and manufactured in the UK for a seamless OEM-quality installation.

• Proven Heritage: Backed by over 40 years of Milltek engineering expertise.

Technical Specifications

• Pipe Diameter: 3.15” / 80.00mm

• Material: 304L Stainless Steel

• Fitment: NAS/ROW Spec Vehicles

• Installation: Cutting of OE system required

Compatibility

• BMW G90 M5 Saloon (2024+)

• BMW G99 M5 Touring (2024+)
  (For NAS/ROW specification vehicles only — not compatible with OPF-equipped EU models.)

Unless explicitly stated otherwise, all products sold by R44 Performance Limited are designated RACE ONLY and are solely for competition or off-road use limited to racing formally sanctioned by a recognized racing organization. Any other use, including recreational off-road use, may violate local, state, and Federal laws. R44 Performance Limited does not implicitly or explicitly confirm the legality of using any products it sells on public roads; that is entirely the responsibility of the consumer.

It is the responsibility of the customer to check with all federal, state local and environmental laws before ordering and installing a product. R44 Performance Limited is not responsible for any fees, fines or costs that a customer may incur as a result of failing to check with federal, state, local or environmental laws before ordering and installing a product.

We get a large number of custom orders and requests everyday, so as a result it is not always possible for us to keep every item in stock at all times in our warehouse. If you require the item urgently please contact our sales team here to check the stock before you make your purchase.

We totally understand if you're not certain a part will be compatible with your car, so we highly recommend contacting us here with your query. Our friendly sales team will then be in touch to confirm if this part is the correct part you are looking for.

All in stock products ship the same day if ordered before 2pm GMT

For out of stock items we will contact you with an estimated wait time if not otherwise specified above.

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All of our products come with a standard warranty of 1-3 years. This is dependant on the type of product however. For more details please see our warranty page here.