Dodjy in Australia sent me these pics and very detailed drawings of how he modified his stock muffler. Saves big money over buying a new muffler for us frugal WR owners. Just like the Free mods that make the bike better. This will help the WR's rip. Thanks Dodjy!!--- WR Dave http://img.photobucket.com/albums/v234/WR_Dave/35mmTPfit2.jpg http://img.photobucket.com/albums/v234/WR_Dave/35mmtailpipe2.jpg http://img.photobucket.com/albums/v234/WR_Dave/insidemuffler2.jpg http://img.photobucket.com/albums/v234/WR_Dave/tubesideview2.jpg http://img.photobucket.com/albums/v234/WR_Dave/layout2.jpg Attached is the info you need, feel free to post on the forum if you know how. There’s 2 rivets holding the end on the muffler not 4 (I forgot), I just replaced them with aluminium rivets instead of the stainless ones. Had no worries yet. The 29mm tail pipe just fits through the hole in the end cap while the 35mm version fits snug into the lip on the inside of the end cap. Both have heaps less restriction than the stock one and they only took me 30 minutes to make and cost nothing. I still run the stock spark arrestor. I reckon the perforated pipe and packing will improve it as it will effectively add length to the exhaust so should improve low to mid speed. As it stands now it is still the same length as stock but has more power everywhere. Just remember if you cut the 2nd (front) baffle out there’s no going back. With the 1st baffle (rear one) removed, the bike will still be reasonably quiet, especially with the stock tail pipe so it’s worth doing it in stages if you can. Regards Dodjy.