Since that is a round, straight through muffler, it may be a bit loud/raspy. Although there is a resonator built in that piping, so it may not be too bad..its hard to say really. Any muffler like that, cat or no cat, will tend to be loud/raspy anyway.
how would it sound matched up with an apexi n1 catback and obx header?
like shit, N1 is basically the same as the catback that guy has. i had a testpipe and i couldnt stand it. use a resonator instead of a striaghtpipe, ittl sound alot better