Not to argue with Try Me, but you will see some HP increase but not much if your stock, maybe 5HP or so, I did have headers, and a Flowmaster(on my 90' L-98) as far as the exhaust goes, I did get a little more ET and MPH without the cats about a tenth and 1MPH in the 1/4 mile! but I doubt you will see that much without headers, and a free flowing muffler!
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98'Trans Am LS1 273 gears Whisper lid,K&N,Whisper MAF ends,Flowmaster,Best ET on street tires 13.17 @ 106.49mph
[This message has been edited by LS1JAY (edited 01-16-2001).]