With that MPH you should run low 13's on slicks real easy! sounds like the problem is in your 60FT times, are you spinning or bogging you must be doing one or the other, get you 60FT's down and you'll see some good times!
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98'Trans Am LS1 A4 273 gears Whisper lid,K&N,Flowmaster,Best ET on street tires 13.17 @ 106.49mph
NEW MODS:3" Flowtech cutout,Magnecor wires,NGK TR55's