Allen is an awesome tuner and a super nice guy. I took my 09' GMC 5.3 to Allen first off because he does a wideband on the street and none of the local tuners here would do it. After meeting him and going thru the tune with him, he knows what he is doing. I wanted to keep the Active Fuel Management on and after I left it would not engage. I went back a couple of days later and he got the active fuel management to come back on and never once rushed or complained about the extra 1 and a half hours of tune time. Now my truck gets 21 mpg @ 80mph and it drives so much better than stock. I am doing a cam and stall within the next month or so and only Allen and his guys will touch my truck from now on. Great Job! Sorry for the extra work Allen, but I think I might have to turn the AFM off after camshaft.......