For some reason these days, ZZP seems to be getting all the good "press" in the forum world. No doubt, they are a first class operation with top notch equipment. But, having had a Hahn Stage 5 turbo system installed in my 2007 Cobalt SS, having had no problems with it, and having absolutely blistering power to burn (more than I can actually use on the street), I think that Hahn Racecraft is still very much at the top of this game and deserves a good word as well. Give them a chance to fire back up after the move to Florida, and I think that there will be some stunning new products coming out for the Cobalt, c/o Bill Hahn, the pioneer of Cobalt aftermarket performance.
Last edited by Gonetoofar; 05-21-2011 at 06:26 PM.