what year of duramax but i recommend kory willis at ppei or idaho rob at atptrucksWell he went to J&R automotive in lloyd and got the DPF deleted and the efi live tune for light tow. All I can say is WOW!!!! What a difference in power. Now in want to put the efi live tune on my duramax. I've been quoted $650. Can anyone do better than that??