We have an 06 CRD, and we are getting better mileage than my buddy with his 05. He is running the Suncoast tc kit, about every lilttle mod you can do to the crd engine, like boost hoses, egr/segr box, but no chip yet. All we have done on my girls is deleted the muffler 2.5''' pipe out from cat, egr/segr mod, custom air intake(i mean custom), and thats it. Even running 32'' tires while he was on like 30's or 31's. Also has per the tranny, the 06 has had less problems with tc shutter than my buddies did, reason being why he upgraded as well. Also we wheel are libby, and his is a street queen for now.
And the GDE i cannot wait to get are ecm in for them to tinker with. I have seen and hear so many good things about them guys from Lostkjs, and from talking with them