Rear Silencer with Flap EXHAUST for F82-M4 Vol. 2

The second installment in our BMW F82 M4 exhaust development series.
We’ve created a rear silencer with flaps, just like the stock unit.
Since we’ve reused the stock exhaust flap actuator, operation depends on the stock system.
The flaps are made by LAPTORR and have a larger outer diameter than the stock ones.
When the flaps are open, the larger main pipe diameter improves flow and accommodates increased boost.
When the flaps are closed, exhaust is routed through the rear silencer, resulting in a quieter sound than the stock system.
Next, I will attempt to design a rear silencer structure that is both quiet and offers good flow.