All the dealers still sell them around here
When is the last time you checked? This exhaust thing is really starting to gain traction.
The only one, Yoshimura R77 EPA Approved, is going to make a killing for a good bit as they are the front runner in following the newly established laws that are soon to be in place in full effect.
I am thinking if you get it now or already have it you may be ok if you do not get pulled over for whatever reason. But purchasing one will become increasingly harder.
But keep in mind also, as stated the Senate Bill 435, it cannot be the reason he is pulling you over. It is a secondary citation in addition to why he actually pulled you over. But at the same time I asked an officer a couple yrs ago about how officers being able to give much more during a traffic stop/tickets. We were both standing on the sidewalk and he says ok, I'll show you. He says "see that guy? Didn't use left turn signal. Two seconds later, this guy changed lanes an almost cut him off... see that guy, the tread on his tires are too low and now safe.... see the lady there? She's talking on her phone using the iPhone style mic/earphones, those are not legal due to not being able to hear your surroundings despite hands free law.", etc. He was like, but most of the time there are more important things that need to be addressed so those people usually slip through the cracks. Once you are pulled over he said they can actually quite easily rack up a ton but most all don't and just give the speeding ticket, etc.
So long story short, it wouldn't take much to get pulled over and issued a citation followed by an exhaust infraction if he reeaaaaally wants to go by the book. Majority of time they won't as both SDPD and CHP stated to me last week. Their main concern is your behavior on public roads, if it smoking excessively, or if you have you have just an obnoxiously loud exhaust such as, in his words, "the little import cars that are raced out"...