Just bought a set of Cobra 6 into 6 pipes online from retailer out of Texas. Shortly thereafter they called me to say that on instructions from Cobra, their distributor would no longer ship these pipes to CA. Instead, they shipped them to Texas, and the retailer went ahead and shipped to me since he hadn't updated his listing barring sales to CAlifornia. I imagine this has impacted other manufacturers also... this noise regulation

passed in 2010 and supposedly being enforced since 2013. All pipes manufactured since 2013 need a CARB compliance cert. sticker on them.
I don't think I've heard a Harley with stock pipes yet. Good luck with this, CA.

Scott T