As mentioned, sticker & frame + engine #s are suppose to match! If you can verify that then you'll be fine. I had ordeal with a bike with <7500 miles, and it was painful...
TBH, generally better to buy an in state vehicle, they don't even bother to look at it when you transfer the title.
Originally Posted by scapegoat
You will be required to show the DMV agent the Meets CA emissions sticker or 50 state compliant sticker whichever it has. If its been removed all bets are off. I went thru a PITA bringing in a KTM 950 from AZ because I couldent find this sticker even when the KTM manual stated ALL 2005 KTM bikes are 50 state compliant. They will check the Vin#s and look at the engine numbers and frame numbers to verify against the title and to issue a Ca title. Far as the exhaust they never asked, looked, started it or seemed to care about mods.