The real question, is it a STI? Is the kid willing to launch it hard? aka bounce it off the limiter and dump the clutch? If you answered yes to either of those, you're losing for sure.

If its just a regular WRX and the kid drives like a girl, you might have a chance, but my money is still on the WRX.

Me racing against my buddies STI, he has out MPH'd me a couple times, but his AWD is no match for my big converter and sticky tires.