s14joe,
Well, I have an Apexi N1 dual and as far as fitment issues I haven't had any. BUT when I was mounting it up, I did have to tweak and bend the exhaust pipe and the header pipes at little to get them to line up. It's been on my car for about 2 years now and no problems as far as blowing the muffler. What you could do is just go on eBay and get a N1 muffler for like 25 bucks, and then take it to an exhuast shop and have them swap out your bad one. Probably cost you 50 bucks all together. Worth a try. That's the best thign I can think of. Also as far as fitment issues, did you check you tranny and engine mounts for excessive wear? If they are bad then you tranny is sagging and will also cause your driveshaft to sag thus rubbing the resonator. I had brand new OEM mounts BEFORE I put my exhaust in so I never had any rubbing problems. Check it out.
Good luck.
