exhaust, cat, and downpipe Q's

[2s4x0]

OK, i am very unknowledgable i know and here is my disclaimer*tried searching couldnt find an answer*Since that is done here is my Q.I have a stock exhaust on my car right now. When I get my turbo the downpipe that comes with it is 3 inch. I am assuming that will not fit on my stock cat. I also think that if i just get a new cat then the downpipe will fit but the cat wont fit up to my exhaust. To make a long question short, when i get the T kit will I need to also get a 3 inch catback exhaust system with a 3 inch cat? Sorry if this is stupid Question and I hope i actually made some sense. Any help would be appreciated. Thanks!

EDIT....I AM STUPID, HOW CAN I MOVE THIS TO KA-T thread? Or just delete it and make a new one in ka-t thread....sorry.
Modified by 2s4x0 at 9:27 AM 2/8/2005