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You want be able to hook up 2.5" pipes directly to the manifolds. 2-1/4" is it. You can run 2.5" but you won't gain anything over the 2.25" with the manifolds. Your exhaust will only flow as much as the smallest restriction.
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Chris Lucas
1973 Chevy C-10
1978 GMC Jimmy (2WD) - SOLD
1987 R10 twin turbo LS
1991 R3500 SRW CrewCab
1985 K5 diesel swapped project
1989 K5 2WD conversion w/ Vette susp Project
Captkaos Customs
73-87chevytrucks.com
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