Wow! This build has moved on a lot since i last looked, i love it! Might i suggest you make a list of the companies you used for the bespoke parts, so that others that want to go the same route, have a known/proven parts upgrade builder/supplier?
Unless you're running an external wastegate, you won't hear anything as an Internal wastegate dumps straight into the exhaust. I'm guessing it's something else you are hearing, maybe a loose intake pipe.