I have been the owner of a 01' WR426 since 01 and I just recently got an 00' YZ426. As soon as I got the 00' I checked the valves and all was in spec. The bike seemed to run good and there was no sign of smoking or anything. Easter weekend I installed the DB Dawg I had in my WR and noticed the other night that when I started the bike up in the garage the garage was filled with smoke and I had a strong fume odor all over my clothes. I removed the DB Dawg and it was covered with black soot. Could this insert of caused something to go wrong due to the added back pressure or what?