I spoke with Tom on Friday. He is doing a 53C with QSM11's right now. He said it was a 3 ton weight savings and the water line rose 3". I don't know what the performance numbers are but I recall Hook shot could cruise 21kts and almost 24kts WOT with the 12V71TI's. That was with a new bottom and not much gear on board. I would expect the QSM11's to be a bit faster.