Yesterday morning I dropped off my car at the local Chevy dealer, Gwatney Chevrolet in Jacksonville, Ar. By mid-afternoon the service bulletins were done, the leaky tire was fixed and my new (to me, bought on Ebay for $350) Z06 exhaust was installed! I've very happy with it. I don't think I'm getting any more horsepower from it, but that isn't why I bought it. I went with the Z exhaust for the larger tips and throaty growl without it being overly borish and loud. This is, after all, my daily driver. The tone with the windows down and under throttle is great, but with the windows up and cruising on the highway, it is hardly even noticable. In fact, it might even be a bit quieter at cruise than my stock exhaust was! Very subtle change and exactly what I was looking for!