Hello everyone; hope someone can help quick!!

Completed delete on my 2015 6.7L this weekend, MM3, Delete Pipe and EGR with Throttle Valve Delete.

After 100 miles or so of driving yesterday the plug in the rear blanking cap for the exhaust manifold blew out; I assumed it was my fault because I never checked the tightness. Replaced; all was good.

20 miles down interstate I start hearing a high pitch whining that followed boost pressure. Sounds like a radio in a 1967 Chevy with a bad ground; if you know what I am saying.

The sound is is really prevalent on the driver side; I am thinking Intake leaks some where.

I took off work today to figure this out; can some one please shed some light to save me time?