Hi, this my first post on the forum. I have a 06 dodge 3500 CTD, stock except for a jake brake, not the one preinstalled, thats on the 07's, I have the one from cummins. My question is, which exaust should I get? I want an exaust that will get me more mpg, I don't have to have more power (it already has more then enough), but more power would always be nice. My main concern is more mpg. I tow a 14000 LB fifth wheel and want to increase the mpg. right now I get about 11-12mpg towing the fifth wheel, I have the automatic transmission.