Well.... since I just installed my Apexi N1 Dual today.. I figured I'd chime in here!!!
I HATE WORKING ON CARS SOMETIMES!!! The install WOULD have gone off without a hitch... barring a major faux-pas with the damn studs where the Apexi pipes bolt onto the cat. This car IS a 95... but it's only seen 2 Maine winters... the first 5 years of it's life it was in sunny Florida. But the entire exhaust was rusted to s***. Anyway... the studs were so rusted you couldn't even tell there was a nut on the damn things. We used my friends garage... hooked up the air compressor and hit it with the impact wrench.... well I rounded off both nuts as soon as I pulled the trigger.... tried the vise grips...... no luck! Finally had to cut them both off with the grinder... and drill new holes where the studs were. After that (about 2 hours of bitching and smacking my head against the jack stands).... we finally had the stock exhaust removed... and it took about 15 mins. to install the Apexi!!!!

All in all, not a bad day..... except for the fact that I had to drive to Vermont and back so I could use his garage..... but it was a nice 3 hour test drive home!!!
End results..... low end is unchanged.... mid range rpms pull hard... and top end pulls a little better as well. This was my birthday present to myself.... took 2 weeks to get here... but well worth it!