I had PWC Muscle rebuild the SC's and install the upgraded wheel. Supposed to make the same or a little more boost than the X-Charger. Our boats have 48lbs injectors already, I learned this after I ordered a set of 42's. I can tell that there is more hp, but to use it I need to change the impellers as well. I have also looked at the Fizzle intercoolers, as that would be the next add on. But I find I don't work the boat as hard as you would a ski, so I haven't experienced the stock intercooler heat soak issue yet.