Remus BMW G90 & G99 M5 Racing Secondary Cat Back Exhaust System

The Remus Racing Secondary Cat Back Exhaust System for the BMW G90 & G99 M5 is designed for those seeking the ultimate sound and performance experience from their S68-powered M5. Building upon the proven Remus Axle Back System (082025 0500LR), this full Racing Cat Back configuration (082025 1000 + 082025 0500LR) replaces the factory secondary catalytic converters and rear silencer to deliver a raw, motorsport-inspired tone with increased flow and reduced restriction. Crafted to the highest standards, this system embodies Remus’ dedication to precision engineering and performance excellence.

Key Features

• Full Racing Configuration – Combines the Remus Axle Back System with a non-resonated secondary cat-back section, optimising exhaust gas flow and performance output.

• Enhanced Sound Character – Produces a more aggressive, resonant exhaust note that amplifies the V8’s twin-turbo soundtrack for an authentic racing experience.

• Lightweight Stainless Steel Construction – Built from premium-grade stainless steel for reduced weight, long-term durability, and superior corrosion resistance.

• Custom Tailpipe Options – Choose from a range of 102mm angled tailpipes (145mm shorter length) with adjustable spherical clamp connections for perfect fitment and style:

  • 0446 70SGR – Polished stainless steel

  • 0446 70SGBR – Black chrome finish

  • 0446 70CSRX – Carbon fibre with titanium internals

  • Optional: 0448 70GT – Titanium GT finish (requires ADOPT1S-4 adaptor)

  • Optional: 0448 70GTB – Black titanium GT finish (requires ADOPT1S-4 adaptor)

• Precision Fitment – Designed specifically for the BMW G90 M5 Saloon and G99 M5 Touring, ensuring an exact fit using OEM mounting points.

• Racing Use Only – This version does not include EC Type Approval, intended for off-road or track applications where unrestricted performance is prioritised.

Specifications

• Part Numbers: 082025 1000 + 082025 0500LR

• Configuration: Non-resonated secondary cat-back system with rear silencer

• Tailpipe Diameter: 102mm

• Tailpipe Length: 145mm

• Construction: Stainless steel with optional carbon or titanium finishes

• Vehicle Compatibility: BMW G90 M5 Saloon & BMW G99 M5 Touring (S68 engine)

• Type Approval: No EC Type Approval (Racing use only)

Why Choose Remus?

Every Remus exhaust is developed in Austria using cutting-edge acoustic simulation and precision manufacturing. This Racing Secondary Cat Back System unlocks the full auditory potential of the G90 and G99 M5, transforming the car’s character with a sharper, louder, and more responsive exhaust tone. It’s the ideal choice for enthusiasts who demand maximum performance, sound, and quality from their exhaust system.

Experience the uncompromising craftsmanship and thrilling sound of Remus – engineered for those who refuse to settle for standard.

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.

We offer worldwide shipping on all products. If upon receiving your product you wish to return; we offer a 30-day returns policy. For our in-depth returns information please follow the link. "R44 Returns Policy

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.