Dave: What the devil does the inside of a MC muffler look like? I'm betting they are of no kin to an auto muffler? Straight through for sure, but???
Question, anyone: We found a straight through, ie. one can see daylight by looking completely through the thing, ---muffler, a glasspack. It utilizes small punched louvers on the throughpipe, all facing one direction. Wanting the least amount of loud from this thing, does one mount it with the exhaust being 'scooped' by the louvers or by the exhaust flowing over/by the louvers.
In other words, louvers pointing upstream, or downstream?