i had the N1 *muffler only* installed on my 95 Vtec SI and it sounds great... not too loud at all, very nice deep sound and doesn't sound like a fart too
anyway, this is the Turbo Apexi and not the NA muffler. I recommend getting the full catback instead of just the muffler so you will get the full benefit of Apexi cat-back. My bro has this on his 240SX and it angles kinda on the side and it looks cool.... JDM style. I don't know why people say it's too loud... coz it isn't. Maybe if i get a sound clip i'll post it up