What tuner on my cummins 600?

[SLJolley]

We've tried both.

If your looking for power go with the TST. It seemed to have more power then the Crazy Larry did. I do like the code reading function of the power pup though.

 

[BillGotthelf]

My 2 cents worth. Get the TST with 10 levels of torque and 10 levels of power there is something there for everyone. But the bigger the numbers the shorter the life of your trany. You gotta pay to play.