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Message: [QUOTE="Hotrodtractor, post: 710990, member: 25"] Stainless might expand and contract a lot in the heat - but many will agree that if you have a high heat application few things beat 321 stainless. That being said I don't recall if I've ever heard what these headers are truly made out of. Yes - I had solid up-pipes and didn't have any cracking issues with my headers and numerous 2200*F runs on them. My back pressure has been limited to about 60psi for most of the life of the headers that I had on the truck (although there was a couple of runs that was closer to 90psi.... I fixed that by changing turbos). I'm not sure if back pressure is also a contributing factor - but I I'd be willing to bet its a major difference between our setups considering I've always been fuel only. [/QUOTE]

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