If your PCS'ing to Cali and have out of state plates, keep them. When I was stationed out there I kept my plates from when I was stationed out in Yuma and never had any issues with law enforcement.Finally pulled the trigger on my first big part for the 15 FoST. Got the Semi resonated Milltek Catback on and it is an awesome piece of hardware. Installer was impressed with how well fabricated it is and how effortless and precise its fitment was. Only additional items used were a set of Cobb hangers. I will say this to anyone considering this exhaust. If you like loud exhaust, than this is not for you. I would recommend going with the non res and even then I've heard they are relatively quiet. This exhaust sounds close to stock with the one resonator with the exception of a deeper tone and a better range of sound at WOT. Having a newborn and possibly PCSing to Cali I wanted to do something that would keep the car under the radar but still give it a nice sound and more aggressive look. Honestly, I hope that as I drive it more the sound becomes more refined and possibly deeper but I've never been too sold on the argument's of "break in periods" for exhaust tones. We shall see!