I have a line on a near new set of these stainless steel oval mufflers for baggers that S&S makes. I've been able to read up on the sound here on the forum...what I would like to know about is the performance. I'm just at 88" now, but am thinking big bore and a cam over the winter. Has anyone run "free flowing" mufflers and then put these on. How much quieter are they and is there a power loss?