Dear Gents - after shopping new Dodge with Cummins I ended up buying a used low mile 2006 with a 5. 9. I was told over and over by auction purchasers for dealers that the 5. 9's are selling at auction for more than the same year (2007) 6. 7's as the 5. 9's are easier to modify, get much better fuel mileage, don't have excessive emission controls, and are a proven performer. He said like equipped at the big Texas auto auctions are 3-5000 difference in monies! Is it warranted to pay more or not? Please comment. Also my payments would have been nearly $200 per month more for new!