Beware of Kleemann
I only mentioned it because "it's not his first rodeo"

Most people know that OEM exhaust on an N/A car was not designed for forced induction applications .
Either way, the fact that any of you think a 100hp gain @5psi on a DOHC 6.2 sounds right, just because of the exhaust, is laughable. What do you think the C63 comes with, 1" manifold collectors and a 2" exhaust?!?
Either way, the fact that any of you think a 100hp gain @5psi on a DOHC 6.2 sounds right, just because of the exhaust, is laughable. What do you think the C63 comes with, 1" manifold collectors and a 2" exhaust?!?



