No diet at all, the only thing I remove is my spare tire, jack, and sub from the trunk. The times in my sig were with just headers, Quaife, K&N drop in filter and drag radials. The car weighs 3070 lbs with me in it according to the scale at Houston Raceway Park.

99 T-Red SVT #1634/2760 K&N filter Aussie Intake Pipe Pro-M 75mm & Optimizer B&M Edge Shifter Quaife LSD Borla Cat back MSDS Headers/sho-shop Y-Pipe Dynoed at 184.2 HP & 157.2 TQ 14.53@94.15