Hello To all . thanks for the imput full throttle and Ausie. The egr I figured out last week. Bought a $23 piece from Gm. After talking to a few folks, Most told me to go with the old school coolant recovery system. Coming out of the 5.3 is 2 smaller outlets down low. A 5/8 and 3/4. Which is the return? I am guessing the 3/4. I might have to take a drive to Elk grove one day to see Full throttles truck. I have a cherry seat for sale. Thanks, Alan