This past weekend my '00 Burban got a quick tune for e-fans, calibrate the MAP and Fuel trims, as well as delete the EGR (kept fighting a vacuum leak at the intake). I then tackled the oil pan gasket, new oil pump seal, and new water pump (pickup up a solid 5psi of oil pressure). All to find out the rear main seal is leaking too. Lovely. Man she drives SUPER smooth after the tune though. That tune was worth every penny. With all the goodies, I'm hoping for some decent gas mileage come our family vacation this weekend!
Oh got a new instrument cluster that has a working message center.