No no no...you misunderstood. Obvioulsy I saw the first post if I bothered posting here to begin with. I meant a list of parts (cai, tb's,intake manifolds, etc...), not just the type of part (S or R tunining type). I just purchased a 02 GKE with a 7yr/70,000 mile warranty and I don't want to jeopardize that.GarrettSER said:Michael, please look at the first post that chimmike bothered to post for all of us here. S-Tune: maintains warranty, R-Tune: does not maintain warranty.