Welcome to both the board, and DSMs! You've got a lot of fun, anger, hopelessness, and pure bliss ahead of you with that car.
I do agree with the suggestion to buy a manual car and swap the goodies over. But, whatever you do, I have to say don't stick with the auto. They take forever to shift, so half the time you're WOT, the clutch is disengaged. I've got a friend down in Ames with an auto 1gb with a small 16g running stock boost, and he cannot for the life of him outrun my stock 2g, despite the fact that he should be getting more power up top. It pulls hard, but that's only when it's not taking 2-3 seconds to shift.
You should come to OC tonight. details:
http://www.mitsustyle.com/forums/showthread.php?t=17507