I am thinking about buying this unit for my 03 2500HD with the 6.0l. What are the power/torque gains for the 87/91/93 tunes. I also have a heavy camper and tow a boat. Are there custom tunes for this application? Does your unit have data acquisition? Such as trans temp, etc.....? Thank you.

If I buy a used tuner for my truck, from e-bay or such. Can I get updates and custom tunes from the manufacturer. I think the unit for my truck is the U7195. My truck is a 03 2500HD with the 6.0l motor.