So I've searched and read, and searched and read some more, and it seems that no one has stopped to think that maybe the smog control on the XR650L is a good thing. I personally really like the high quality of air I breath in Northern AZ and am all too familiar with the southern California experience. For what little performance/weight difference the thing makes...I'm leavin it on. It's nice to know that I own a smarter bike...the kind of thinking that separates us now from the 1920's...the same thinking that had people chain smoking because it looked cool and made them feel like heros without regard for the pollution it stuck in their body's. Who gives a @#$% about aesthetics. Dual sports are ugly bikes anyway, but I love em. This bikes a blast.