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The issue that we have with your runners is that we have to worry about both fuel suspension and air flow. The good news is that changes in area and steps will both hurt both.
I wish that I had dyno'ed my engine before the intake maifold modification, but I am reasonably sure that it helped.
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1986 GXL ('87 4-port NA - Haltech E8, LS2 Coils. Defined Autoworks Headers, Dual 2.5" Exhaust (Dual Superflow, dBX mufflers)
1991 Coupe (KYB AGX Shocks, Eibach lowering springs, RB exhaust, Stock and Automatic)
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