I have a Volvo 122s rat rod like sedan. I’m running a 2 1/4 single exhaust with a glass pack & Dyonomax muffler. I think it is a turbo muffler, but don’t remember. It is annoyingly too loud for my taste now. I’m thinking of adding a second turbo muffler. Any thoughts on this, i.e. loss of significant power, not much difference, etc?