Yea traction is your friend, my car stock(stick shift) with gt500 lca's went 13.15 at 103 with the stock pirelli's with a 1.79 60 foot. These cars are heavy pigs, the sixty foot can make or break you. For every tenth off the sixty usaully amounts to two tenths off the big end. I had the same mods as you(minus the long tubes) with my 05 stick car and with et streets I was running 12.40's at 109-110. Is your car a auto or stick?