Ima make this short but I recently received my custom tune from jay greene and my truck runs like a champ, if i am on smooth black top with my 321 gears i will burn my 33/1250 tires through first, second tell it catches thired. If your on the fence and unsure of who are were to get your tune from I HIGHLY RECOMMEND GREENE RACING. The guy emailed me step through step on how to upload/download my tunes as well what should my next upgrade be as well. I'm not bashing no other custome tunes are anything like that. I'm just speaking on my experience and trying to get the word out there THIS GUY IS LEGIT AND IS AWSOME TO WORK WITH. You won' be sorry.