GRAIL | BMW G8x M3/M4 Competition Valve control Exhaust

Loud but Legal

GRAIL valve exhaust systems with ECE type approval can be driven without registration on your EU vehicle. They are handmade in Germany from high-quality L304 stainless steel and produce a distinctive sound that will give you goosebumps from the very first engine start.

Maximum Volume

You drive your GRAIL loud but legal.

With intelligent control, you get the legal maximum out of your engine sound.

The use of highly effective mufflers allows for maximum volume and wonderful engine sound outside the test ranges, as only in these ranges are the valves of your GRAIL closed, and only closed is the rear muffler a part of the exhaust flow.

Your GRAIL can also be quiet.

With a GRAIL, you get two vehicles in one.

They use specially developed mufflers, designed and adapted for your vehicle in the GRAIL sound lab. The combination with massive valves is designed not only for maximum sound output when the valves are open but also for maximum damping when the valves are closed.

When you drive your vehicle within the respective test ranges, your GRAIL is no louder than the standard system. Highest quality and materials ensure the unique delta between loud and quiet, which has been unmatched for years.

Flow

Your GRAIL is designed so that exhaust flow is minimally affected. A significant improvement over the standard system is naturally achieved through a larger pipe diameter and reduction of constrictions. Your GRAIL does not obstruct the exhaust flow.

Massive

Our stainless steel valves, CNC machined from solid material, switch depending on the model within the prescribed measurement ranges and thus allow the perfect combination of back pressure reduction and extreme volume from pure engine sound.

Quality Made in Germany

With a GRAIL, you get what you have always been looking for. The highest processing quality of the best materials combined with the maximum possible sound for your vehicle.