gt2 is short for exmag gt2 the origional is just the exmag check out the site
i can tell the GT2 is going to be loud. it has 1 bend and no resonator, just a scilencer but i love the slip fit design and the quality of the welds seen one that the guy i order my stuff from had in stock for 2nd gen integra and fell in love, it was more than i wanted to spend but i figure its worth it cause they arnt that popular and the design is just so bad ass. it actually goes under your gas tank instead of around it .