It's about 21.5x7.5. I have modified 3 of them to date. The best you can do with a brushed motor is 21x2 with a way smaller prop. The stock props 44mm and was ment for a 27 turn long can air cooled 550 motor. It will burn up low turn motors in seconds. I kno I'v seen me do it 3 times in 2 days. If it's brushless you want then a full hull mod is the only way possible to suport the torque and rpm. The hull has to be gutted and refloored from 3 inches above the motor mount to the stern. A transom doubler is also a must. Further more both sides from the floor to the deck, bow to stern have to be laminated with glass or thin birch. Now that you have a ridgid hull, the drive system has to go & be replaced with a minimum .130 cable system to an offset strut a rudder system. A 10L on an 80 amp esc powered by 2s lipo will round out your mod. All said and done your hull was designed for 15mph. You will only be able to hold it on the water for up to about 25. You may make 30 but it will be a wicked ride. Hope this helps you out. Good luck and have fun :).
Frankly I hope the OP does not mod this boat too much - he will not like it. The CBox hull is not stable at speed and will flip very easily. He will get tired of going after it all the time....this was the problem with the Crackerbox racing class, cool boats with close racing intended for beginners but it became a pro class because few beginners could keep their boats upright.
A modest modification program (19-turn motor, 6 sport cells and an x431 prop) would be okay, but frankly for a little more money a much faster and more reliable boat can be found or built. I know the attraction of modding your current boat, but as SJFE states you will have issues.
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