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Old 09-27-2009, 07:13 PM   #1
Scooby Newbie
Member#: 148846
Join Date: May 2007
Default Some questions about installing some STi parts on my 2.5i

There's a shop in my town that is selling me quite a substantial amount of STi parts. It includes intake, headers, exhaust, turbo, oil pump, oil pans, STi pistons/rods, and they say everything I need to go turbo with my car. I will have them install it in the end. My car is a 2007 Impreza 2.5i, and the car the parts are coming off of is a 2005 Impreza WRX STi. I would just like to know what complications there may be in this whole process? I asked this in the tranny forum, but haven't gotten any answers, but I feel I may have to upgrade my clutch after this as it has 53000 miles on it, and will be handling much higher horsepower after this is all said and done. When I get a new tranny, what will I have to change to fit an aftermarket clutch?
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Old 09-27-2009, 08:04 PM   #2
Scooby Newbie
Member#: 217112
Join Date: Jul 2009
Chapter/Region: AKIC
Location: Fairbanks Alaska
1998 GC8 modified
black and orange


Well the 2.5I is a sohc not the dohc. ive herd of some people making the 2.5sohc perty nasty but dohc heads run a different compression ratio. if you run the stock compression ratio you will not beable to boost what the stock wrx boosts without damaging the lower end. its possible with changing the pistins youve lowerd the comp ratio but im pretty sure your going to want to look into that.. also your gunna have to run a turbo controller of some sort seeing that your stock Pcm dosnt run any of those drivers. its a great deal of work to be paid for but an awesome hobbie to invest it. i do all work my self im not going to pay someone to do it which is nice cuz i have more money to invest in other cars. but good luck with ur motor i hope it turns out successful
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