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2000 Formula, M6, 334rwhp with old rust mods. 60' 2.06 1/4 12.62 @114.72mph New, less rusty mods in process. 04' GSXR1000 About the headers...They look like 1 3/4 to me. You'd probably want 2 1/8th minimum for a 600hp engine... ~UglyValiant