Grail BMW M3/M4 OPF Back Exhaust System (G80/G81/G82/G83)

The Grail stainless steel upgraded exhaust system for the BMW G80, G81, G82 and G83 M3 and M4 vehicles produces an incredible sound. The Grail system transforms the driving experience of the S58-powered M3 and M4. Gone is the strangled rasp of the factory system - not to mention the sizeable weight saving! This exhaust system is an OPF-back, retaining the car's primary and secondary catalytic converters in place, as well as the OPF on UK/EU cars. If you have a US market vehicle, this system works great as an axle-back, by removing the restrictive resonator and replacing the flawed OEM backbox.

The use of highly effective silencers enables maximum volume and wonderful engine sound. When the valves are closed, the exhaust gases flow through the rear backbox to allow the system to remain quiet for daily driving. When the valves are open, the rear backbox is completely bypassed for maximum noise! The rear silencer is also angled upwards so you don't see the ugly 'udder' that you get with the factory system.

SPECIFICATION

- Hand-crafted in Germany from high-quality L304 stainless steel
- Significant weight savings
- Retains OEM BMW valves
- Massively improved sound with the flap open and closed
- 100% handmade using the TIG welding process

COMPATIBILITY

- BMW G80 M3 Saloon (2021+)
- BMW G80 M3 Competition Saloon (2021+)
- BMW G81 M3 Touring (2023+)
- BMW G81 M3 Competition Touring (2023+)
- BMW G82 M4 Coupe (2021+)
- BMW G82 M4 Competition Coupe (2021+)
- BMW G83 M4 Convertible (2021+)
- BMW G83 M4 Competition Convertible (2021+)

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.