considering turbo

Ok so im considering turbo for my ex...but I have a skunk 2 catback, and I hear you need 3'' piping w/ a turbo so will I haveto replace/modify it? Also I was trying to look around and find a decent turbo kit w/ all the goodies (intercooler ect.) for decent prices with no luck...anyone have any recommendations on what brands to go with or any good deals on whole packages?