I bought one from a person that imports 3" S/S Turboback Exhaust systems that come with all the bolts and gaskets plus an up-pipe for $650. They fit from 94-06 wrx and sti's.

I had the pleasure of bolting it on myself with my dad and brother on the weekend. Saved myself $1000 in the process, i got to know my engine ALOT better and it sounds GREAT. Had a LITTLE fiddling around, but after a few lining issues with a bracket (which wasnt even THAT bad) we got it to fit.

You can go to xspeed and pay $1700 and get it done nicely, or you can give it a crack yourself and save some money plus learn from the experience. And honestly, id do it again if it saved me $1000 again!