I own a 1989 Nissan 240sx hatckback with an RB20DET engine and I just want to know if this engine is legal or illegal In California cause I got pulled over by CHP and issued me a ticket for loud exhaust and for an emissions violation would it pass the State referee visual test please help

No engine swap is legal. He had every right to give you those tickets.

The only way you can pass emissions and crap is knowing someone who you pay off to just pass the car. Best thing to do is put a silencer in the car so you aren't suspicious at all.