Several years back DC wasnt going to share critical codes for charger tuning. Kenny Bell dropped the blower for the ram, And Magna charger also couldnt get support. Also dropped the charger.
Later out came STS turbo or something like that that mounted under the bed near the muffler. I know personnaly a Purchaser / sales rep and he never got his working correctly and it all came down to lack of ability to tune correctly.
He put over 8000.00 in trying to make it work, First off the 'Complete kit", then came a tuner with very little help with no mapping just shift points and raised top speed and a couple hundred RPM's before the rev limiter.
These setting provided in tuners are not mapping.
After this he swapped out all of the injectors for I believe a mustang version for increased fuel, Then had a custom fuel rail made for increased volume to feed the injectors. And the list goes on and on.
Im not saying he never had it running, he did. The biggest problem was over 8000.00 and it wasnt hardly any faster in the 1/4 due to how much power was robbed to spin up the turbo by the time it wanted to get busy the 1/4 was over. I think he got into the low 14s. Shame is some guys were getting there with bolt ons and tuner settings. The small stuff.
I cant say I know for sure if Ram is cooperating now with the after market for performance but I know 10 years ago they said NO!
I have never bought a tuner for the ram. The last one I saw has preset uploads IE: premium octain setting. So I set it to 91 octain go fill it up and then what? Im sure the higher rev shift points and top eliminator can give the idea of greater performance but I really doubt anyone feels 7 hp gains. Most tuners I saw back then said for best results use with CIA and improve exhaust flow. Welp, theres your 7 hp. and 10ftlbs tq.
I love Ram trucks there just isnt a real performance after market that really makes a difference yet.
Then again im fine with stock.