The N1 would be the best choice but make sure that u go to a muffler shop and get a 2.25" downpipe and get it either from the Manifold and back or from the converter and back! Normally that is a cheap way to get a good performance exhaust. Then add ur High flow cat, headers and so on. Getting a custom pipe made costs about $130 which is not bad and that is what I recommend, it would make ur muffler sound better!