[911racer]

Hi guys,
I HAVE MY DOUBTS!
While I agree that the 2 Supertrapp cans look great underneath a car, I dislike the way that they work (restrictive principle). To reduce the sound, you have to remove some plates, which reduces the amount of orifices through which the gas can escape, which reduces the flow and increases the backpressure. It will be ultimately quiet when you plug the exhaust pipe shut. A bit of common sense will tell you that it cannot be the right way to make power!!
Most other good systems uses a perforated pipe (but without internal restriction), which guarantees a free exhaust flow. The sound waves escapes through the perforations into a chamber (the silencer can), where the sound energy is partially absorbed / diffused. That is the way to make power.
But, as I have previously said, the Supertrapps look great, if that's what you're after.
Regards
Stef