[Canuck_Targa]

I have no idea of the numbers, but what I felt (seat of the pants) going from full cat to test pipe, (Schnell says 11hp with their pipe). I felt about the same again, but my ass is far from sientific.
It does seem to have better thottle responce with the free flowing system, but I did it mostly for the throaty but not overwhelming sound. I used the Dynomax, and I have heard the Flowmasters, and they are a little louder but Flowmasters have a real unique sound. At cruising or on the highway there is little difference from stock in my opinion, just a different sound.