Hi, I know a lot about her and spent lots of money and time looking after her, absolute great rough water boat as she was the only one ever fitted with a duo prop drive so there is very little prop torque trying to throw you on port chine as you re-enter the water having been airborne, probably the closest you will get to a twin engine rig running counter rotating props, certainly never needed trim tabs, she would always run 69-73mph fully laden, never able to quite reach its full top speed potential as when she was built the drive was set slightly to high which means before can get her fully trimmed out onto the very last part of the rear chine the rear prop starts to cavitate as it comes to the surface, we did try to play with cupping the blades which helped but didn't cure the problem. The earlier DPX drive that was fitted broke within a few weeks of me buying her. The Volvo 802GSI was 425hp, I do fear that if your 575SCI is healthy and making the power that the DPX drive will find it difficult to deal with not only the horsepower but even more so the extra torque, fingers crossed for you that it holds together and you have fun with her.