I went with the cool duel cat back. You won't get any codes with a cat back system. The exhaust is a bit louder but in a good way. I did not want a loud system and was worried about the added noise, but the sound is a nice deep tone. Not an obnocious noise.

I went with the cat back because I didn't want to store the cat for resale, I didn't want a loud truck, and the truck does not gain any noticable horses with the removal of the cat.
I just wanted good sound to go with the power the edge gives me:ro)
I am very pleased with the result it gave:grd:
call mark. He gave me a great deal!
Good luck