a full 2.5" exhaust and your going to talk about smooth power delivery? Who knows what kind of difference it makes on a 500-600hp turbo. ie food for thought. BTW, how many mods for the Z sacrifice a little lowend to create more topend? Some of us are interested in what makes more power. My point was the 3.5" exhaust was not causing turbulence and cool down past the x-pipe on a low powered car, when everyone and their grandmother says it will.