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that whole header setup is made out of 316l and 321 stainless, witht he exception of the crossover which isjust heavy wall mild steel,and a mild steel 3 inch downpipe out to the factory location precat.
my large turbo the t74 runs a 4 inch downpipe out to the same location,we came up on the small turbo though 52mm
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#1 1989 RS - 3.0L V6 11.0-1 CR, LIGHTENED CRANK,J.E FORGED PISTONS, CUSTOM 280/284 .575/.575 116LSA ROLLER CAM, PORTED HEADS, PORTED INTAKE,CUSTOM TURBO KIT W/ BW S475,AW INTERCOOLER,METHANOL INJECTION, TCI STREETFIGHTER 700R4 W/ TCI 4,500 STALL,TWIN WALBORO 255'S & 83# INJECTORS
268 rwhp & 367.6 ftlbs @ 10 psi 3.1l
12.30's @ 112 3.1L @ 9 psi
??.?? @ ???? 3.0L @ 18 PSI
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