[MikeG356MT]

Welcome! What Doggy Door said is a good point of reference, I got about the same gains with the mods I did (K&N CAI, Borla exhaust, pulleys, grounding kit). I realized almost 40hp with those mods and you can really tell. Now the Stillen exhaust 1st gen is loud but I hear they have toned it down a bit. I still like the Borla however, you cannot beat a million mile warranty! Good luck!