I am so glad that you are taking it to Redlands Performance Center. I have had such good luck with them with my Dynasty. Everything was fixed the first time.
DEF (Diesel Exhaust Fluid) came in 2011 (I think). DPF (Diesel Particulate Filter) came out in 2007. Your 2006 is emission free except of the EGR. Your engine will probably smoke a little on hard acceleration but it's cologne to us guys. :p
Do not take your coach to Colton Truck in Colton. They attempted to fix my dash air 3 times with no success. Redlands Performance fixed it the first time and it last for 3 yrs. when I then sold the coach on consignment in TX.
The inside of the Executive is beautiful! Very similar to the Dynasty we had. The tag axle on a 40 ft. vs. a 42 ft. coach will take up a bay space but you will love the ride and handling.
Good luck,
MM.
