I just got a 2014 ZL1 that’s completely stock. As a mechanic of 35 years and not new to turbos or superchargers. So looking at everything on the system for the supercharger, I realized I could increase the boost about 3 psi from stock without pulleys or tuning. The ECM is still in control and setting no codes. The factory gauge is now in between the middle and 15. I haven’t hooked up an actual gauge yet to see, but the car is now completely different. Breaks traction at 60 mph when floored. Makes instant boost at 1500 rpm. Torque is unbelievable now and traction control is almost useless even in stage 1