Outlaw RR2150 Receiver Power Cord?



I was reading through the manual and noticed that it says NOT to use any other power cord except the one provided with amp. Most, if not all companies have encouraged replacing their stock cords. Why would Outlaw Audio discourage owners from using an aftermarket power cord? I have been using an aftermarket power cord for a few months now with this receiver with no issues it has actually improved the sound in my setup.

Any other owners using an aftermarket power cord with this receiver?
taylor514
"Most, if not all companies have encouraged replacing their stock cords. "

Say What?? Think about this.
I have seen the statement to not replace power cord from a number of manufacturers. When I asked one why, they stated too many customers used cords that did not meet proper specs and could potentially damage gear. They did not say that a good after market cord would not improve performance. And other companies do recommend a better power cord.