Join Date: Nov 2009
Location: Lander, Wyoming
There may be several internal differences of the KLR650 muffler "guts" between different years and specifically different countries. I do not see anything in the video muffler that suggests to being a catalyser.
The rearward most chamber of my 1987 is about equal in length to that mufflers two rear chambers. My 87 tail outlet did not have the "WWII German Tatter Masher" hand gernade appearance, but was more like a 1.5" OD, 5.5" long, 0.625" ID miniature glass pac muffler for its full length. There is a 'Krizman' spiral diffuser, spark arrestor immediately ahead of the 'mini glass pac', at about the location of his 3rd from last partition wall. The 0.625" ID inner pipe of the 5.5" mini glass pac is perforated, its full internal length.
My brothers 2009 Gen 2 muffler has the same tail chamber design as my '87.
The 5.5" mini glass pac was/is not so affectionately know as the "Tweety" by some owners. Due to a gap in the weldment of either the perforated core or the outer casing, some of them would 'chirp' annoyingly at low rpms. So many of them either had chisels or screwdrivers hammered thru them or hole-sawed completely out of the tail end cap. (Mine rusted off inside of the tail end cap, so was hole-sawed out.)
Modify at "YOUR OWN RISK"!
Still riding my 1987 KL650-A1. 85,000+ miles & counting