Flap-Equipped Rear Silencer EXHAUST for F82-M4 vol.2

The second installment of our BMW F82-M4 exhaust development.
We've created a rear silencer with flaps identical to the OEM unit.
Since we reuse the OEM exhaust flap actuator, its operation depends on the factory system.
The flaps are made by LAPTORR and have a larger outer diameter compared to the OEM ones.
When the flaps are open, the larger main pipe diameter improves exhaust flow and accommodates boost increases.
When the flaps are closed, exhaust passes through the rear silencer, resulting in a quieter feel than the OEM setup.
Next, we will attempt to design a rear silencer structure that is quiet yet maintains good exhaust flow.