No replacement for displacement! Or HP/Torque. I've been thru every engine possible and the supercharged motor is far superior to any of these other motor options. My wave forms and Is ready to surf instantaneously. You could sink my boat full of water and the motor never struggles, even at altitude. I've been demoing ri237, G23. Etc. the 450 DI is good but still nothing like my supercharged motor when it comes to the time it takes to get a fully slammed boat up to speed and wave formation. And since it doesn't have a catalytic it's not prone to O2 sensor problems and misc engine warnings when surfing all day. If you have the finances it's the best option out. IMO.