Porsche 997 Exhaust Mods Mythbusted

Intake and Exhaust manufacturers claim how much extra horsepower their parts make, but do they always make it? We wanted to fined out. Rather than spend thousands on an aftermarket exhaust and be let down, we made our own test pipes with no restriction in them to see if its even possible to make more power by upgrading the exhaust on our Porsche 997 Carrera C2.