Like tune , more power , better response. The brake good in hills and when pulling trailer , must be in tow haul to turn on. Can buy just tune or tune with brake . The tune includes trans. tune ,can use engine tune alone or with trans tune. To install you need to buy tune and brake Is more ,well worth it. They sell you or loan you a pass tru tool. You down load your info , send to them , they send you the engine and trans tunes , load them with the pass tru tool. If you buy tool can remove tune and put back to stock tune. Is not cheap, but if you keep your truck worth it