I have QTP cutouts and love em. I almost always run with them open. It's loud I guess but not crazy loud unless I'm throttling it. Mine are probably closer to the mufflers as opposed to the headers. It sounds like it means business but doesn't sound like I have no exhaust.
I have a Roush charger and running a Roush safe tune and have 0 problems.
I get 0 drone at any RPM. Personally, I think it could be louder.