The one that best suites your modifications. Generally its the ones that are 2.5" and have the straightest path to take with the least resistance. Such as the spoon N1, Apexi N1, Amuse N1, 5igen, Fujisibo, there's loads!!!
hi mate, i get told to 'use the search function' too
So seeing as its nice to be helpful and isnt too much effort to type...from what ive seen and read ect i think (and the exhaust i'll be going for) is the spoon n1 exhaust. they have 2 options of back box, race and street. either way you can buy a noise restrictor to bolt into it if its too loud
Intake & Exhaust - Type R (EK9) - Civic - Products