Power Cable options for Levinson 300 series

I currently have the Levinson 33H's, and before them the 336. Both these amps have a Levinson power cable built right into the Chassis. Knowing how much a good power cable can improve a component, I am wondering what I could be missing in improved performance if I was able to put an after market cable on my 33H's. Does anyone know of any way to make this happen for the 300 series, as I believe they all, from the 331 to the 336, and including the 33H and 33's..........have built in power cables!