Cm870 turnup

[3406E]

Got a cm870 I want turn up mostly the torque. It’s stock at 475 don’t know if it’s running 1650 or 1850 but I would say it’s 1650. The cpl number is 8519 build date 2004. Canadian spec truck 3.73 diff little bigger than the regular 18913A. I read somewhere that my cpl number can only go up to 550 @1850 torque, I would not want more than to be honest. I’m fine with even 500 525 @ 1850.
The truck is not deleted. Also looking to take off the speed limit from 65 to 75 mph. I think it was set a 65 because that’s the speed limit in Canada. Any suggestions do’s and don’ts? Go to Cummins to get this done? Any good shops? I have Cummins insite but the the option are locked I can only clear codes and I don’t have calibration files either. Thanks