The perfect combination: flap exhaust systems and HJS downpipes
Combine a Grail valve exhaust system with high-quality HJS downpipes to take the performance and sound of your vehicle to the next level. Discover the world of Grail valve exhaust systems today and experience the synthesis of performance and sound that will transform your vehicle into a true masterpiece. Our flap exhaust systems, as well as the HJS downpipes, have ECE type approval, which means that they can be driven without registration in the EU and Switzerland. Please note that US vehicles may have additional requirements.
Performance and sound according to your wishes
Our flap exhaust systems offer performance-enhancing exhaust routing and the option of customizing the exhaust sound to your liking. With precise manufacturing and high-quality materials, they guarantee a perfect fit and reliability.
Our passion for car enthusiasts
At Grail, we share a passion for cars with discerning drivers. Our goal is to offer the best solutions for customization and the highest quality. Explore our products and turn your vehicle into a true work of art.
| Manufacturer |
Series |
Model |
Type |
ltr. |
kw |
Engine type |
Emission standard |
Note |
| BMW |
M3 |
M3 / xDrive |
F80/F80 LCI |
3.0 |
317 |
S55B30A |
Euro 6 |
|
|
| BMW |
M3 |
M3 / xDrive |
F80/F80 LCI |
3.0 |
331 |
S55B30A |
Euro 6 |
|
|
| BMW |
M3 |
M3 / xDrive |
F80/F80 LCI |
3.0 |
338 |
S55B30A |
Euro 6 |
|
|
| BMW |
M4 |
M4 / xDrive |
F82/F82 LCI |
3.0 |
317 |
S55B30A |
Euro 6 |
|
|
| BMW |
M4 |
M4 / xDrive |
F82/F82 LCI |
3.0 |
331 |
S55B30A |
Euro 6 |
|
|
| BMW |
M4 |
M4 / xDrive |
F82/F82 LCI |
3.0 |
338 |
S55B30A |
Euro 6 |
|
|
| BMW |
M4 |
M4 / xDrive |
F82/F82 LCI |
3.0 |
368 |
S55B30A |
Euro 6 |
|
|
| BMW |
M4 |
M4 / xDrive |
F83/F83LCI |
3.0 |
317 |
S55B30A |
Euro 6 |
|
|
| BMW |
M4 |
M4 / xDrive |
F83/F83LCI |
3.0 |
331 |
S55B30A |
Euro 6 |
|
|
Product safety information
Manufacturer information:
HJS
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