Roost Exhaust Systems - Official Support Forum

We have completed the development of the exhaust for the Stage6 R/T cylinder.
The first part was done on our dynamometer. We tested many different solutions until we found out the most optimal one. Read more of the testing of the cylinder and exhaust in THIS article.
To complete the development of the exhaust, we took our race scooter to the race circuit, we went to the final race of the Stage6 cup in Ottobiano, Italy, where we competed in the highly competitive class "open-expert". We were pleased with the performance of the engine, the power delivery was smooth and high enough. We had some transmission problems in qualifications, so the starting position was "only" 14th, but after solving the problems before the races, our driver, Tomaž Koršič managed to climb up to 9th and 6th place in the 1st and 2nd race.
So, case closed, the exhaust was ready to be put into production.