I should add, if you decrease the temp of the gasses (as they cool passing thorugh the exhaust system), they proportionally decrease in volume. The big question is "how much do they cool...and how fast"? Factors that affect this are: surface area (larger diameter pipe and/or mufflers, the ambient temperature, the velocity of air passing over the pipe, fuel mixture, and timing. There are other factors that affect the rate, but are less influencial.
That was my comment on hard to figure how much without an A vs B trial.
Another factor often overlooked in the whole equation is header tube diameter. Too big can decrease the velocity into the exhaust system and even my 2 chamber Flowmasters caused reversion until I dropped to a smaller tube size. This also decreased the open header to exhaust system difference on that motor.
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Skip Fix
1978 Trans Am original owner 10.99 @ 124 pump gas 455 E heads, NO Bird ever!
1981 Black SE Trans Am stockish 6X 400ci, turbo 301 on a stand
1965 GTO 4 barrel 3 speed project
2004 GTO Pulse Red stock motor computer tune [email protected]
1964 Impala SS 409/470ci 600 HP stroker project
1979 Camaro IAII Edelbrock head 500" 695 HP 10.33@132 3595lbs
1964 Corvette Coupe 327 4 speed
Last edited by Skip Fix; 12-06-2013 at 01:27 PM.
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