I went to San Antonio and had Allen tune my 2003 1500HD 6.0L Crew Cab. The only other mod I have is a UPD air intake. G-Tech time before was a 16.31 quarter mile @88.50mph and the temperature was around 45 F. I finally ran my truck today after the tune and it done a 15.75 @ 94.6mph and the temp was 63 F. The increase in time was .56 in the quarter and it should run a littler faster at the 45 F temperature as my base run. Hopefully it will get a littler cooler soon so I can have a better comparison but I wanted to report the improvements I have gotten so far. Thanks Allen.