I am new to these Diesel trucks and just bought a 02 Duramax CC, SWB, 2WD. My dad also has an 04LLY that I bought and installed a Superchip programmer. He pulled my streetcar to the track and he ran 14.96@92mph,which I thought was good. Both of our trucks are 2wd so I bought a Hypertech,and put it on stage 3(113HP), for $200 off of Ebay last week, ran it on the G-tech, it did 14.90@96.8mph. I know the G-techs are 4-5mph off but have used it on many trucks and it's always within 1tenth. How are these ET's compared to similar trucks? I plan on running it at the track in the next couple weeks. What would be the next best mod to be a little quicker than my Dads 04LLY? I was thinking of putting a cone K&N filter and maybe a new free flowing muffler? LMK Thanks Clint