I tested a theory a few years ago on my car. The exhaust at the time consisted of 3 inch X pipe, cone reducers to 2.5 ultraflows and 2.5 inch tailpipes. Just by removing the tailpipes the car picked just over one tenth and 1 mph in the quarter mile. This was on a well tuned and tested car. Many at the time who were aware of the test thought there would be zero gains. app 550 to 570hp engine at the time.
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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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