First of all the days of turbo lag are gone. Turbos used with the right EFI combo can make horsepower numbers than supercharged engines only dream of. Because of their success they have been banned from many sanctioning bodies. This is a shame because you have no idea where turbo technology would be today if it weren’t for being banned. I have spent 18 years working with EFI Turbo setups. There really is no limit to the horsepower potential. (well there was back in the carb days) There are 3 liter turbocharged engines on the street today that make more horsepower & torque than MerCruiser’s most powerful supercharged racing engine. The only drawback to turbochargers other than expense is their emission ratings. With cleaner air standards tightening these days turbos just cool the exhaust too much to burn clean.
I would love to see turbos used in powerboat racing. Imagine all of the horsepower you want in your boat.. then double it. That is what turbocharging technology can provide your engine. Right now no one makes a drive strong enough to handle it and I don’t think you will see one that can within the next decade.