19. Graph 1: Modern Mouse 383-NA vs. Whipple Supercharger-7.4 psi When it comes to serious performance, basic bolt-ons will only take you so far. Nothing wakes up a motor like a little boost! Putting the screws to our Modern Mouse was a 2.9L Whipple supercharger. Running just 7.4 psi of boost, the twin-screw supercharger improved the power output of our 383 from 541 hp and 518 lb-ft of torque to 718 hp and 626 lb-ft of torque. Measured peak to peak, the supercharger improved the power output of the already powerful stroker by 177 hp. That kind of gain can only come from boost.