Looking for full supercharger/turbo kits, intercooler, etc.

Try Your local Nopi, O Reilly, G reddy or wven Autozone. Most Car shops have some connections to the tuner industry, so just go in and ask to see their performance catalog.

Just about anywhere..since you are on the web try searching ''subaru performance'' You should get lots to look at. One word of advise though.be careful of force feeding an old engine (turbo). If you just picked up a subaru with 75k on it that was driven only to church and back this engine will have established wear in the cylinders. If you start hot rodding it the pistons will try to stretch past the established ''lip'' it has developed and you might break a ring or two. Good luck!

You can find some parts here http://subaru.com/microsites/spt/parts.sptmain

First off, l am a 2006 Subaru Impreza WRX owner.
Do not, l repeat, do NOT go to any AutoZone, Kragen or other local auto supply store.
First, visit NASIOC.com
This will provide you some information in the Legacy Outback section. Register! And you will take in the wealth of info. there. You will definetly find some for performance parts there. If not, ask and they will refer you!

l am also a member of the above mentioned site. Go there & go to i-club.com. Those r the 2 best forums.

As l recall.there is someone on i-club that did a build up on a legacy wagon just like yours. He did not go forced induction but he did a lot of other work. Go & look for it in the Ongoing Projects thread.

You may want to consider an engine swap rather than going for a bolt on kit. l have read that the price of the engine swap is pretty much on par with the price of doing a bolt-on/custom kit. By engine swap l mean to swap in the turbocharged engine from the 2002 & up WRX or if u can swing it, a 2004 & up STi. You should be able to find a 2002 WRX engine for a reasonable price & hopefully the wiring wo not be that bad.

Another positive of the swap versus the kit is that the N/A motor was not built to handle boost. As such, if u leave all the internals alone u will only be able to safely boost it to like 5-8 PSI. Which will give u something like 140-150 whp. The stock WRX motor makes about 170-180 whp (227 at the crank) at about 14 PS l & is easily modified to give u much more than that.