(forgot disclaimer: the mod will void the warranty and possibly shorten the life of the motor, do so at your own risk)
Comparison of stock shroud, larger DIY shroud, 6055 prop and 6100 prop, from right to left:
Another viewing angle:
The 6100 prop is a good fit on an Aquaclear 110 powerfilter magnet driver, only needed to sand down the single tooth on the driver to be flush with the prop to minimize unnecessary drag:
Fully assembled 6055 after the mods, the Aquaclear 110 powerfilter (not powerhead) magnet driver fits on the motor perfectly, a 6100 fish screen was cut then glued on:
A few quick stats:
Stock 6055: Total watts 20W, motor watts 18W (from Tunze), flow 1453gph (from Tunze);
6055 with larger DIY shroud: Total watts 23W, motor watts 21W (estimate), flow 2000gph (estimate);
6055 seen above: Total watts 26W, motor watts 23W (estimate), flow 2500gph (from my bag test).
That is about all I have done so far with the pump, not bad so far. The pump was put into the tank last night, running completely silent. It is hooked up to a single controller set on pulse between 30% and 100%. It kicked up a major junk storm but no sand was disturbed.
I just checked the tank it is now clear, and I had a hard time telling if the pump is running unless I look very closely, it is that silent.
And BTW, all the mods were already done before the arrival of my 6055, the result of my many failed attempts to mod my 6025s with bigger props. Now at least I feel a little vindicated.