FWIW, I read this whole thread about 2 years ago, trying to decide if I should buy headers along with uppipe and tbe. IIRC, most lost power early, some gained later. I wasn't impressed with any, but the borla was the best bang for the buck. With rumors of cracking, I'm taking my chances with the ebay headers, which should arrive tomorrow. For $125 shipped, I'll be the guinea pig!