I have the tuning from RR Diesel and love it.

I'm running the 120 tune full time and it's so amazing.

They don't recommend running the 150 or 200 without a new tranny and new head bolts.

Anyone out there doing it?

I really would like to put it on the 200 tune to see what it feels like but I'm not trying to break a tranny or blow a head gasket.