I thought I'd start a new thread about this. While I was doing a pressure test on my truck to look for boost leaks, I noticed air was hissing out of the breather tube near the tappit cover. I replaced air filter with a silicone boot that has an abs 3.5'' plug on other end with an air compressor fitting in it. I connected that to air line with regulator set to 5psi. Is this normal to have air coming out of that breather?