05 Ultra and had dealer do a 95 this past spring with a flash. Now seems to ping and have been offered a Power Commander. Question is if I install this with the flash what happens..Power Commander over rides the flash, it works along with the flash or what..And if I hook it up and do not like it then what..If it is taken off whats the flash doing...Working as it is now or is it gone from the ECM...Also is there a way to confirm what you set up on the Power Commander is bad or good..Lean or not....Perfect or average..?

 

The PC will just "trick" your ECM and not change it so if you took the PC off, your ECM would still be what it was prior to the install. If you are going with a PC you could always have it dyno tuned and dialed in properly instead of using a canned map.