I put this tune in a 04 gmc 4x4.It works pretty good.Noticable power increase,uped mpgs a bit.It did have a little spark knock at wot,right before it would shift.All and all,good tune.
A forum community dedicated to Chevrolet and GMC diesel truck owners and enthusiasts. Come join the discussion about duramax engines, performance, builds, modifications, classifieds, troubleshooting, maintenance, and more!