speedpeddler

Those are some damn fine looking headers and your guarantee is unheard of. But, I still wouldn't put headers on my car unless I also did the pulley, TB and a tune. Even then, I probably wouldn't because of the cost and the related issues all aftermarket headers have. That being leaks and stress cracks eventually, underhood heat and reduced access.

I know I'm playing devil's advocate here but my own personal experience on lots of cars doesn't support large HP gains with the addition of JUST headers.