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Old 07-04-2010, 01:10 PM   #1
Scooby Newbie
Member#: 230408
Join Date: Nov 2009
Location: Illinois
2006 Impreza 2.5i

Default What are my options?

Ok, so I'm new to the Subaru world and I got an 06 Impreza 2.5I.
I really don't know much about them, but first what's the diference between
the 2.5I, WRX and STI? Talking engine wise. I know that the WRX and
STI are turbo and the 2.5I isin't. But what about components locations?
Can I swap components from one to another? Lilke cylinder heads, pistons, etc?
You might think I'm stupid, but I've allways owned Hondas and in that world you can swap almost everything. This is my first Subi and I don't know my options.
Any help would be much appreciated.

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fourdown is offline   Reply With Quote
Old 07-04-2010, 04:36 PM   #2
Scooby Newbie
Member#: 216224
Join Date: Jul 2009
Chapter/Region: SCIC
Location: bakersfield CA
1999 2.5rs


well we all gotta start somewhere, and your not stupid, just new to somthing different. to answer your question, main difference between yours and the turbocharged models is that your engine is SOHC whereas the wrx and sti models are all DOHC, which cancels out most engine part conversions youve listed. and put simply, your block is not made for turbocharging, and the wrx/sti blocks are built for it, so there are many other differences
such as compression rates etc. the 2.5i block dosnt have much room for upgrade, but there are minor things you can do to squeeze a little more power out of it such as the basic exhaust kit, intake kit and ecu tune. but the real potential in your car lies in the handling. if i were you i wouldnt worry to much about making horsepower. i would start by upgrading things the suspension, such as shocks/dampers, springs, swaybars, strut bars, bushings and such. your car may not have the power of a wrx or sti but look at it this way, if you put some work into the suspension, youll handle almost the same as the big boys, youll have more mpg than the turbo guys, better reliablility, in other words youll have an awsome daily driver thats easy to maintain and fun to drive.
sn3a is offline   Reply With Quote
Old 07-05-2010, 06:20 PM   #3
Scooby Newbie
Member#: 230408
Join Date: Nov 2009
Location: Illinois
2006 Impreza 2.5i


Is there any turbo kits for my SOHC? If there's any, where should I
start looking?
What about the block? I know that the internals aren't made for boost,
but are the cylinders any good? If a put some good rods and pistons, would
it hold some boost?
I'm not looking to make 400hp, but would like to put atleast 5 to 8 psi or
whatever it would hold. I allready hav a couple of things from my previous car
and would like to use them somehow.
fourdown is offline   Reply With Quote

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