Tocsik asked :
Do Harley's blow 'em out like this, too? ....................................
Yes , I had a 2007 883 (fuel injected) Sportster. When it melted I was on the way from Lynchburg Tn. to Mena Ar. (South Central Arkansas) . The day was hot and I was running 75-80 mph for a long time.
Two weeks later I noticed there was no exaust coming out the rear of the back muffler . Thank goodness for the cross-over pipe!
I put on a pair of 12" shorties with DB-Killers in them and that was the end of the problem.
I've tried the same mufflers on the S-40 but have found they need a lot of muffler packing rolled in there on the motor end and then the DB-Killer at the rear. Don't trust those little bolts that come with the DB-Killers --- the person behind you when they blow out gets mad !
https://www.ebay.com/itm/EMGO-80-45700-MUFFLER-SLASH-CUT/133334066758?_trkpar...This is the good stuff .
https://www.ebay.com/itm/CERAMIC-SILENCER-EXHAUST-MUFFLER-PACKING-KIT-1-THICK...They come in a long version too.