My engine came pretty bare. No knock sensor or PEVR valve. I installed the MSD Boost regulator and it helped but is not enough. I would like to go back to stock and see if performance is better. I lag bigtime at the start and knock at 10Lbs. boost. I know you guys have been through all this before I just can't find the right threads. I found this http-::www.turbobuicks.com:forums:before-black:24315-solenoid-power-valve-control.html and it might be an option for the PEVR, but I'm having difficulty finding a knock sensor. Any insight. Thanks