I don't know about the legality of exhaust work but I myself live in California (San Diego) and I have gone with the Borla axle backs. I also looked at JBA and Magnaflows but I ended up going with the Borlas because of the look. I installed them this past weekend and they have been awesome! Can definitely feel some extra oomph when gunning it. However, they have a considerable amount of drone to them at around 1500-1800 rpms. It can get annoying. If you do a lot of driving in that rpm range (city driving) you might want to get more information on drone from other brands. The sound of the Borla is awesome, especially under WOT and also when cold starting. The installation was easy, as I'm a novice and was able to install in about 2 hours. The kit comes with everything you need (clamps, etc...). Only tools you'll need are a 15mm socket and wrench and a 13mm socket and wrench. The look also improves greatly. The stock pipes definitely don't compare to the polished look. Hope this helps and ask away (no questions are too beginner) :laughlitt