I'm the guy along with a couple of others who have been using the single muffler/dual outlet design ebay exhaust. Cost $175 shipped back in '09 summer when I got it. Has 60,000 miles on it and as good as the day I had it put on.
2.5" piping, no silly crimps under the rear axle area. Only thing needed to be done is getting those horribly crooked and ugly tips replaced.
I like this because it's not loud, and it's not a couple of fart pipes like the other $300 ebay exhaust (I HHHAAAAAAAAAAAAAAAAAAAAAAAATEEE fart pipes, they kill any car's unique sound, save a few, very few exceptions).
Sounds even better with the Racingling Y-Pipe (but don't expect to beat 350Z's quite honestly....it's a hair, if that, faster than a stock 3.5 coupe).
Here are threads in the Engine/Tuning forums:
altima-coupe-3-5-ebay-exhaust-racinglin ... 00117.html
another-ebay-exhaust-t433377.html
Check my signature below for sound clips, I have 3 of them.
And BTW, there is such a thing as a red flashing "search" button, just saying since one of the mods will tell you that.

But I don't mind sharing/reposting once a year.
