FWIW..When my car was running low 11's (11.3/121)the exhaust consisted of 3 inch x pipe 3 inch mufflers and 2.5 inch tailpipes. Just by removing the tailpipes the car picked up 1.5 mph and .15 in the QTR mile.
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466 Mike Voycey shortblock, 310cfm SD KRE heads, SD "OF 2.0 cam", torker 2
373 gears 3200 Continental Convertor
best et 10.679/127.5/1.533 60ft
308 gears best et 10.76/125.64/1.5471
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