blinkbox&airwaves

Okay, so you see the specs in the title. I can get a turbo for really cheap. A Garrett with most everything except down pipes for 350! I'm going to get them, but I need to swap trannys with a Honda Si or at least a GSR right (5 or 6 speed)? Or could it be okay to leave the PSI at like 4 or 6 and not overheat the tranny until i get a one next summer. I don't want to buy a tran cooler. And also, let me know about other things I can do to tunes it for speed! (And I already know with an auto trans it won't be that fast). 164,000 miles on engine/trans.

THANKS!