i have been running duramax tuner since November i bought the truck with theses tunes well after riding in a few other trucks i decided i wanted to change tunes. I ordered tunes from ridge runner diesel performance and all i can say is holy shit my truck felt quick but now it feels fast. tony really knows his shit i cant explain how happy i am with these tunes i just want to also describe the two tunes nicks tunes feel very progressive they start slow and roll into it tony tunes are supper snappy and start strong and keep pulling so needless to say tony is awesome and free updates and he is currently running a summer sale