I bought my wife a 07 white TBSS AWD in 07 and I love that truck, honestly having not taken it or the GT to the strip I think it would be a pretty close race. The downside is the TBSS's are known for having transmission problems, GM used torque management to try and save the trans but its still a 50/50 shot. Up side is there is a 100k mile warranty on the trans, we have almost 20k on ours and no issues but we havent modded it at all either. A stall, electric fans, and a tune will get you into the VERY low 13's to high 12's.