Hello All! I just got Stillen HFCs and dual intakes and now my Z sounds so much more raspier than before. I really dont care for the sound at all. I've heard the HFCs make it more raspy but I didnt expect this odd sound.The Nismo exhaust sounded ok before the other parts but when added the cats and intake it sounds really ricey. My mechanic said he had to take off the damper becuz it won't fit with the HFC but I have not received it yet. Is that the problem? I noticed the problem after it downshifts I just want it to have a nice deep rumble..with of course the added hp! Any suggestions would help! Thanks :)