apexi n1 catback exhaust questions

hey guys im new to this but i was thinking on putting the apexi n1 catback system onto my 2004 sxt neon, i was wondering if i would have to get my car remapped if i put it on, or will it bolt on and run good as is, also will it fit for sure? it always says in most places, for 00-03 is there a difference, my engine is pretty much stock i just have a k&n CA intake on it as of right now. thanks a lot guys........if anyone knows any additional info it would be greatly appreciated....