I have a 05 reg cab 6 speed duramax, i just put the Edge Juice on her, (90) hp. I am thinking about stacking another programmer on there. Depending on say i run another 100 HP will this cause the stock clutch to slip? what is the average hp that will cause this clutch to start getting loose? Thanks

You are probably at the limit of what the stock clutch will hold. You may want to look at a good Solid Mass Flwheel/Clutch setup.

Check out the ZF-6 aftermarket forum and do a search for a clutch upgrade.

I wouldn't bother with stacking until your tranny is upgraded.