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As long as I'm on a roll have a question about my exhaust, Iv'e got most all the pieces for my motor edelbrock rpm heads, air gap intake, and edelbrock 7122 cam pretty much their rpm kit question is can I keep my sunbeam specialties headers that have 1 1/2 inch tubes and my 2 inch exhaust or should I upgrade to cat headers and go with a 2 1/4 inch exhaust. Using my existing exhaust will save me quite abit and I can always upgrade later on. Thanks