Could always toss a nitrous system in there. Your stock motor would be find with a 75 shot. Just need to retard your timing a little bit & add a little fuel. Your call. I'd personally go the turbo route but under your time condition of a few days & the cost.. it's just not going to happen. You may be able to beat the WRX in the long run.. his only serious advantage is gettin his azz off the line coz of the all wheel drive. well, Good Luck & let us know the out come.. i'm very interested!