You might run with a stock LS1. But if you raced a TA with all those mods and he only pulled you by that much.....somethings up. Maybe the 50 roll was horrible spot for his stall/gear combo, cuz a stock stalled A4 with LT's and other boltons should pull you hard. Not saying it didnt happen, just musing. I raced a full bolt on 99 GT(shorty's, midpipe,cb, TB/plenum, gears,etc.) in my stock SS, and we were dead even. This was from a roll as well, which with my stock 3.23's put me at shitty dead spot in my powerband.