I had a lightbulb moment reading your post about mufflers. I have toyed with the idea of changing my Magnaflows for something a little more tame. My main concern is really limited space. The thought of making my own mufflers never even occurred to me.
Would you happen to have any more details on how you built them?
These will be very similar to a dynomax. Straight thru design,stainless small perforated tube wrapped in stainless steel mesh,then packed with 1200 degree ceramic insulation.