What tuner would you recommend for a manual 2nd gen?

 

Quadzilla Adrenaline is the only tuner worth considering these days for a 2nd Gen Cummins.
It's the only one with current ongoing development and the only one that allows full custom tuning.
The otter big name on the market is the Edge Juice With Attitude. It WAS the hot setup until the latest new software for the Adrenaline came out.
It's OK but only runs "canned" tunes, it doesnt allow custom tuning.