the n1 and the gtspec are about the same loudness, and sound almost indentical...its hard to tell the difference between the two.
the gtspec is shiny, and is a little bigger than the n1 in size, other than that, they are pretty much the same. my gt has nice rumble while cruising, certainly not obnoxious or anything, and a very nice roar at upper rpm. if you like the angled look, then this is the exhaust to get. i'd take a pic, but i have nowhere to host it....i can send u some emails of it tho...just let me kno. later
kevin