Be really nice and suck up as the fine can be up to $10,000.
http://www.arb.ca.gov/regact/afteroff/afteroff.htm
"The state board may collect a civil penalty not to exceed onethousand five hundred dollars ($1,500) for "EACH" violation of Section27156 of the Vehicle Code. Any penalties shall be paid to theTreasurer for deposit in the Air Pollution Control Fund. (c) The civilpenalty specified in subdivision (b) may be collected for one or moreviolations involving the tampering with or disabling of agasoline-powered vehicle's air injection, exhaust gas recirculation,crankcase ventilation, fuel injection, carburetion, ignition timing,or evaporative control system, fuel filler neck restrictor, oxygensensor or related electronic controls, or catalytic converter, or forthe use of leaded fuel in a vehicle certified for the use of unleadedfuel only. "
http://www.leginfo.ca.gov/cgi-...rieve"
http://www.leginfo.ca.gov/cgi-...ts=20
Then there are the Federal fines and mandantory jail time for emission tampering. Never enforced except against shops who do the work.........repeat offenders.
You might turn states evidence and help them nail the people who installed your illegal equipment.
At the worst you must return everything to {OEM} with brand new parts.