Haha, here's the disclaimer from twisted throttle about these bars.
****Special Note: These bars will not fit the California model without removing the special emissions package, which we do not endorse. We have been told that if you have a high degree of mechanical aptitude, you can make the crashbar fit.
I ended up just kinda moving the canister out of the way with the bar, didn't have to trim anything or make any other mods. I wonder how many sales they have missed out on from people with California emissions models.