any reason you would go with a 98 2.5RS?
I picked up a 99 2.5RS this past fall for a commuter/beater so i just kno a little from research about em........
If you are going with a 98, then you are gonna need a new front bumper for the 2.5rs look I imagine you are going for, you are swapping in a new engine, why not save some bucks and get a non RS impreza, perhaps even an older year?
If you move up to 99 then you get a better motor (course this doesnt pertain to you since u are swapping it out) comes with the front bumper you probably want, and a couple little neat things like the clear headlights which look better IMO...
if you pick up the most recent SCC they have a how-to for a wrx motor swap. They say it is pretty much plug and play in any outback, legacy, or impreza from pretty much any model year until you go before like 95 or something and then its only a matter of a wiring headache......in the article they swap it into a legacy i beleive but they say its the same for all of em
best of luck to ya! if fast AWD is your goal then this is the way to go (or turbo 2.5rs motor), but I liked the p5 loaner I had more than I like my GC8.......course that could be due to mileage and stuff but at any rate, if i coulda gotten a p5 instead of my impreza, even tho it woulda been less useful for winter driving, im pretty sure i would have.