Went with the group purchase and got BBK 80 Throttlebody last week and got the stock on off the 5.3 and replaced it with the new one. Very easy job to do. The hard part was remove the coolent lines fro under the throttlebody. I let it idle until the fans came on to reset the computer. I messed around with it some highway miles and some quick startes with nitrous. After 200 mile my check engine light came on. Going to hook up to a code reader tomorrow. It sound like it loves to breath. I think it will be a good mod for my truck.