Supercharger Boost Control System by SmoothBoost - Whipple 2.9- GM LS CAR, TRUCKLS Whipple Boost Control System SmoothBoost Active Bypass Gain total control over your Whipple2. 9charged GM LS engine with the SmoothBoost LS Whipple Boost Control System, replacing the factory vacuum bypass valve with a precision electronic setup. This solution brings smoother throttle response, improved drivability, and easier tuningeven on high boost builds. The system uses a reliable 05 V signal for valve control instead of relying on manifold