My car is relatively quiet inside at 70 mph with 3 inch exhaust.
From what I've tested at the track with a low 11 second car just 2.5 inch full length tailpipes was a restriction. I'd assume a full 2.5 inch exhaust even more.
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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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