The greddy is a waste of money nowdays. I'm willing to bet the cores are all made in china. You can get the ebay 24x12x3 for $249 and is polished as well. I run that on my mustang and it works great...a few people have made over 600 rwhp on it and outlet temps were well within accepted limits. They also have the 4 inch for 50 bucks more.

Unless you just want greddy bling i'd get the ebay one. I have the Xo2 version bar and plate version. Just buy that one and have someone make you some IC pipes.