So I have a Subaru Impreza R 2009 and I am lookin for a side skirts and front and rear kit. I found one but, it says it will only fit on the RS or WRX or STI does this matter because from first glance an r and rs, wrx and sti have 2 major differences. Wight and power.(also interior) please help if you know if it would be wise to buy this.

Thanks.

STI's (Wide Bodies) have differences to the WRX.

For your model look to WRX (Narrow body) and they should fit possibly with minor tweaks.

I have successfully fitted WRX and STI items to my RX in some instances with no issue some need minor adjustments - eg WRX S exhaust required a different ring seal upfront due to the diameter of the RX manifold being smaller than the WRXS

if they are the same age they will have the same underlying chassis, however there are wing, crash protection, and even material differences between them.

that said,

 

classic use same chassis

bug-hawk use same chassis but with more structual differences

hatch is individual

and im not 100% on the ones following that