Need some help trying to figure out what to use for a check valve from the intake manifold to the driver side valve cover. I recently turbo'd my car using an On3 kit. Basically I have a huge boost leak because it's going from the intake into the head and presurizing the motor rather than just the cyclinders per se. I have it plugged off right now, but that's causing other issues. Basically I need to stop the air from going to the valve cover, but allow air to escape the valve cover back to the intake. I know this may not make sense to most, but surely there are a few who do. I've tried to use check valves from other cars, but can't find one that I can use inline or has been big enough ports without having to step down the hose to a much smaller diameter hose. That just leaves more room for leaks. Anyone have any suggestions?