I was wondering if a 4.8L ECM could be retuned for a 5.3L Engine. Just wondering because I know a kid who selling one, but he doesn't know the tune any longer. He said it is either for a stock 4.8 or for a supercharged 4.8. Will Nelson Tuning be able to work with it, because I want to send it out so he can just pre-program it for my upgrades. Any info helps. Thanks.