gotta agree with B A P
its a rally car, not a track car. Sure it goes fast but that's not what its made for....as I said in another post...if you're going to hammer nails you buy a hammer, not a pipewrench. Sure the pipewrench is heavy and can drive nails, but that's not what its for...and you don't go out and spend a bunch of money on modifying your pipewrench to drive nails better.
the BEST way to get your WRX to pull harder be a better track car is to disconnect the front wheels from the drivetrain and run RWD. Some performance car vendors do this to get better 0-60 times and WHP numbers to impress unsuspecting WRX'ers.
but hey, its your car, your money and your pipewrench