I was wondering if anyone with a G35 coupe had an Impul exhaust on their car. And if anyone has seen a dyno chart or something with the hp gains. I heard a sound clip on g35turbo and it seemed pretty loud. I might just go with a Stillen exhaust. I don't want anything too loud but with decent gain.

 

Stillen FTMFW

It has the best hp power gain

and is not to loud