This thread is so great...
Just race him, its not like you guys can go really fast anyway

Quote Originally Posted by digitalcraft
I may get flamed for this but:

It really depends on what kind of racing you do. On a track, the WRX will beat the pants and underwear off the mustang.

HOWEVER:
off the line, and for at least a short distance, the mustang has a pretty good chance, simply because the WRX has to spool up its turbo for horsepower, and the mustang will have quite a bit more low torque.

Off the line(yes, we were on city streets, but I think we got up to all of 40mph) my thunderbird LX (205hp, weighs as much as an elephant) beat my friend's WRX.

For stop to low mph speed, a larger displacement engine will win.
If the WRX is a manual, he could just do a redline clutch dump (probably breaking his tranny though)AWD hooks up, and the Mustang stands no chance what so ever. From a 5-10mph roll, the Mustang might pull for a second before the turbo spools, but it wont be significant enough to come close to winning.