I am about to purchase a 94-98 subaru impreza. I have alot of questions about this because I planto drop a 2.5rs engine into it...or a loyale. Either way a 2.5 with about 160 hp stock. Need to know the following.

Where to find a good turbo
where to find a body kit that aloows col air intake on the front....
Basic place to find good parts for a good price.
The difference in suspension between an impreza and an sti... i was really good suspension.
a good set of tires for a good price...
Basically info for people who have done it. In the end I want 300-320 HP with turbo. Looking to not put too much strain on the 2.5 engine (i know about 250 hp starts this) so I need a good mods that dont destroy my engin too much.