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Discussion Starter #1
2008

MODEL FRONT REAR

Impreza 2.5i 19 mm NONE
WRX 20mm 15mm
STI 21mm 18mm
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2009

MODEL FRONT REAR

Impreza 2.5i 19 mm NONE
WRX/GT 21mm 16mm
STI 21mm 18mm

Rear sways are interchangeable between all models, front sways are NOT!

if you have information or direct measurements stating otherwise, please PM me and I'll modify this post. So many people are asking, i figured having a stickied and checked-over thread would be good.
 

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Discussion Starter #3
why aren't front sways interchangeable?
WRX sways cannot be used on the 2.5i (without modification) because of the exhaust routing...the cat section on the 2.5i usually hits aftermarket WRX sways.
WRX sways will work on a 2.5i with modification though...as I'm doing, you just need to mod your cat section a little bit.

As far as the STI...Quoted from Tougemonster:

"Although the STi front sway cannot fit the other models. The WRX unit can fit the STi and are actually stiffer because of the shorter arm lengths. I know of a few people who run this way for better steering feedback and love the results."

You may have to use some spacers on the endlinks to make the WRX bar fit the STI.
 
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