by Unleashed Tuning, My truck came with a SCT so i emailed Torrie about a tune for running 100 LL, after 4hrs of hair pulling and trying to figure out how to download the tunes Torrie finally got me there, of course it took about 50 emails of questions to him on how and why it wouldnt work, i did ask him numerous times to call me to talk me through it which wouldve been 10x faster but he wouldnt call which is my only gripe but overall the truck has come to life, i have a ScanGauge live data reader so i can see what the timing is doing along with some other things, Its ashamed we have to pay to tune our vehicals now days, What happen to bolting on bigger carbs and putting the timing where the engine ran its best ??? lol o well just thought id share my experience with my new tune and hope to hear about any others.