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I am looking into the possibility of buying a WRX STI and have heard from a somewhat reliable sorce that since the WRX STI puts out a decient amount of hp already that in order to do any major upgrades that I would have to rebuild or replace the trans. My sorce says the trans will not take the ammount of hp it will be given and will tear itself up. I don't totally agree with him, but wanted someone elses advise as to any problems i may encounter if and when i buy my STI and start upgrading it. Not sure exactly what i would upgrade, but prob new exaust system, intake sys, cold air intake, ground effects kit w/ wing, upgraded turbo possibly and at bottom of list would be NOS... the list goes on of coarse........ i basicly want to know if the trans will take more than 380hp with the stresses or a daily driver and rare 1/4 dashes. Bare with me, I am just getting into impreza's and I admit i prob dont totally know what i am talking about, but would like to know anyones struggles upgrading them cars and any future problems i might run into if I were to buy one..... Any help would be, well helpful.

Thanks,
Ian
:smile:
 

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Well, they have been running the STi six speed in RALLY situations in the SCCA ProRally. They have been pumping 26PSi of boost into the engine- and guess what- the tranny is holding up!

They said that that equals ~380HP, and that it could probably take up to 29PSi of boost. This was all in an article from the December of January Grassroots Motorsports..

Unlike the WRX 5-speed, the STi 6-speed is pretty beefy. :smile:

The upgrades that I plan on doing in the long run include: programmable engine management, exhaust, ball-bearing turbo..

JJ
 
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