every time you bring it up. The "gains" vs. another similar piping sized system are so marginal that in reality ANY cat back system will yeild those numbers. The problem with the HYPER is that it doesn't fit or match the lines of the Z, to me it looks like it doesn't fit the car. I don't agree that its "too agressive" its just cheezy, small narrow cans matched to similar sized tips just doesn't do it for me. Go install that pop charger and exhaust before you go making any more claims about HP gains on anyones car.
Live with it, if you like the HYPER so much your going to have to accept the fact that ALOT of people really don't care for its look.