Clean 15, I will be going with ******** tunes to avoid the smoke that I have. Their website advertises tunes with no smoke so hopefully the stink will go away too.
Its amazing to me that a "tuner" can get away with "tuning" trucks without providing dyno results or any sort of comparison.
I don't have a lot of diesel tuning experience, but coming from the gas turbo tuning world, if guy tuning didnt show any comparison or dyno graphs of proof he would be immediately hung...