I was wondering if a stock catback from a 95-05 Sunfire GT can bolt up or be made to fit a 2000+ pontiac 2.2l sunfire 4 door SE? will the hangers work or have to be custom made? and the other question is will a 2000+ sunfire SE/GT 2 door rear bumper fit a 2000+ 4 door SE

The hangers as well as the routing of the exhaust are identical w/ 2-doors and 4-doors. I have a 96 Sunfire GT parts car that I took the whole exhaust from. It bolted up in all the stock mounting points using the stock hangers. Granted, I have a 2.4 in my 4-door, so some welding will be in store for you, but it's the same concept.

And no, the bumper will not work for you. The only rear bumpers that are interchangeable w/ 4-door Sunfire's and 4-door Cavaliers are 4-door and 2-door Cavalier bumpers.