R44 BMW G90 & G99 M5 S68 Primary & Secondary Exhaust Catless Downpipes (2024+)

The R44 BMW G90 & G99 M5 Primary & Secondary Catless Downpipes are engineered to offer a high-quality, great-value solution for owners and tuners looking to unlock the true character of the S68 4.4-litre twin-turbo V8. Manufactured from durable stainless steel, this system replaces both the primary and secondary catalytic converters within the factory exhaust, removing two of the most restrictive sections of the OEM setup. The result is significantly reduced back pressure, faster turbo spool, sharper throttle response and a far more aggressive V8 exhaust note, all while delivering precise fitment, long-term durability and a sensible price point.

Key Features

• Stainless steel construction for strength, durability and heat resistance

• Replaces both primary and secondary catalytic converters

• Major reduction in exhaust back pressure

• Faster turbo spool and reduced turbo lag

• Sharper throttle response and increased exhaust volume

• Raises the ceiling for tuning potential on the S68 engine

• Supplied with a 1 year R44 Performance warranty and fitment guarantee

• Engineered for accurate fitment on G90 and G99 M5 models

Important Disclaimer – Motorsport-Use Only

These downpipes are strictly for motorsport-use only. Removal of the OEM catalytic converters breaches European and international emissions regulations and may exceed permitted noise limits in certain countries. Vehicles fitted with these downpipes will fail a UK MOT test.

Fitting catless downpipes will trigger an engine management light and can place your M5 into limp mode. Custom coding or aftermarket tuning is required to run these downpipes correctly. R44 strongly advises that use is limited to closed-course environments such as track or drag strip applications only.

Compatibility

• BMW G90 M5 (2024+)

• BMW G99 M5 Touring (2024+)

• Engine: S68 4.4-litre twin-turbo V8

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.