so i have a 2014 6.7 tuned and deleted already with an hs minimaxx, has new cp4.2 and injectors, stock turbo occasionally gives issues building boost. mostly if ive been driving and shut the truck off for a few minutes and then jump back into go somewhere it doesnt want too build boost pressure. i knw the 11-14 has a finnicky turbo setup so im looking too upgrade too either a smeding budget turbo, mdps budget turbo or a 2015 factory conversion. my biggest question is a keep getting mixed reviews as too whether or not a custom tune is required??? ive heard some people say you will jsut have a cel on but the truck will run fine and ive heard others say tuning is required... if its just a cel then im not worried, its getting harder too get custom tunes.