I just bought an 07 250 CCSB with 98000 miles on it, I am fixing to lose the 100000 miles warranty and wanting to do some things to add power and help make the truck more reliable, it has a k and n air intake and a straight pipe on it at time of purchase, I hear the EGR is a good thing to do but the local shop is charging 2500 to do it, it seems a little expensive to me, I do not race it I use as my