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I ran Racing beat headers through a straight pipe to dual Dynaflow (piston engine-straight through) mufflers on my '86 when it was N/A and the clutch fan was still louder than the exhaust. My '91 is WAY louder than the '86 ever was with full racing beat exhaust except for the stock catalytic converter between headers and y-pipe (I am sure that a lot of that is the useless slush box between my eccentric shaft and drive shaft).
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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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