I have an 03' WRX wagon...my friend just bought a 2006 Forester XT...
I'm thinking about parting my car out...
Does anyone if any of the following parts can be interchange able?:
Wheels?
Spring?
Rear sway bar?
Exhaust?

 

The wheels will swap over, but the WRX has a slightly different offset (Forester uses +48). Not a big deal unless your friend wants to go with wider than stock tires.

I believe the springs will fit, but it's usually better to use the full take-offs (WRX struts and springs) on the Forester.

WRX rear sway bar is too short for the FXT (needs 04+ STi sway bar).

Depending on which exhaust, it can usually be fitted with a few minor modifications (one hanger needs to be relocated, tip might need extension to keep from melting the bumper). I'm assuming you mean aftermarket exhaust, because the stockers are pretty much identical.

 

I swapped a few items from my RS when I got my XT, have a look in the Forester Section of Scoobymods. I have lots of things documented. Good luck.

 

Sounds good...I'll check subymods as well
but yea...all are aftermarket...
borla hush exhaust
perin rear sway bar..
H&R springs
and I also have a set of Tein Type H springs too..
and rotas torques w/48" offset