Indeed my SCD-333ES with Modwright mods also has the Bybee filters installed. Todd is very enthusiastic about the Bybee filters. In my initial impressions, I was not as aware of the improvement wrought by the Bybee filters as I was the original upgrade (I got his standard upgrade first, then later sent it back to have Bybees installed). The first upgrade literally blew my mind, I was less sure about the effect of the Bybees, but i had attached a standard cheapie power cord to the SCD-333ES rather than an aftermarket audiophile cable.
However, since then I've upgraded to a better power cable (VD Power 3, soon to be Signature Cryo) . I can't say how much the Bybees enabled the Power 3 to shine vs. the new cable. Nevertheless, adding the Power 3 to my system has really opened my eyes. How much of the obvious improvement is due to the Power 3, how much to the Bybees, I don't know. All I know is, together, they are astounding! PM me if you need more info. Cheers.