He could possibly pick up about 30-40 rwhp with a full exhaust and tune. Not sure if it is a m6 or a4 but stock a4's tend to put out better numbers in the 1/4mile even though it has more drivetrain power loss. I think you have an outside shot of beating him from a dig. But I wouldn't bet on it, and I also wouldn't race him from any kind of a roll.

 

I think the tires that come with the car are too narrow a size for the amount of power the LS2 puts out.....They need more rubber to the ground to have better launches consistantly.....