I originally bought the SCT and custom tunes when my truck was stock. Since then I added a 66/71 s300, RCD 180's, FASS 150/180, AFE CAI and ITP RR. I had custom tunes made for that set-up. I just recently changed back to the stock turbo and was curious if the tunes I have when my truck was stock will work well now with the larger injectors. I assume that the truck will not perform at its optimum performance. I will be getting custom tunes for the larger injectors but I was curious for the in the mean time wait. I am running stock tuning for the time being by the way. Thanks.