In the photos attached you can see the final silencer with exhaust valve pierburg as Ferrari 430. It is a good choice to reduce backpressure when engine go up with rpm. The sound become phantastic when the valve open !!!!
In the photos you can see the exhaust terminal with pierburg valve which releases the exhaust once the engine revs up by diverting the gas from the silencer and reducing the back pressure in the exhaust. Suitable for those looking for something different that is very close to that of the latest Ferraris.