Yeah, the little M90S in the kit isn't going to win you any horsepower contests, but I have to say its instant torque production is pretty tough to beat. It really makes my Luxobarge get up and dance. Its small displacement allows it to spin up reaaallyy quickly. My starts making boost right off idle and puts out over 360lb/ft to the wheels by 2,000RPM. Something I never could have accomplished with any N/A set up....it doesn't matter how many valves the heads had.