What should I check if my valve is leaking under higher boost?Updated 3 months ago

The most common cause of a valve leak under high boost driving is a leak in the hose supplying boost pressure to the valve. That boost pressure going into the valve is what keeps it closed, so if you have a leak on that supply side, or some sort of restriction, then it could lead to a valve that will open under high boost driving. This supply-side issue could be related to a problem with one of the hoses, a problem with the factory boost solenoid (if your vehicle has one), or a problem with the fitting which supplies air into the valve.