My early Banks setup just had a lock washer on the center airbox bolt so obviously couldn't be sealing very well. It still made 2-3 psi at 2600 RPM empty cruise, 5-6 at 3000 RPM cruise or slower towing cruise, and peaked about 10 psi with a load or just moving quick at high RPM empty. I'm guessing this is likely why others are reporting 14+ psi with non wastegate Banks, but the leak can't be terribly bad to get those numbers. Statoseal is the way to go for this center bolt into the intake? Banks diagram for the wastegate setup shows a statoseal washer and then a regular washer above it then the center bolt. Ordered those parts as well as a rubber seal for a standard Holley carb air cleaner. Hopefully these make an improvement when putting it back together. With my luck I'll do this, it'll push 14+ psi, and pop a head gasket.