here in the bay area (calif), it depends on how bitchy the cop that pulls you over can get. technically, if it "looks" legal enough, it's legal! haha (seriously). if your gonna change any lights, MAKE SURE YOU HAVE ALL YOUR SIDE AND REAR REFFLECTORS~~!!! it's the most obvious thing to cops! for engine stuff, just hope the cop doesn't ask you to pop the hood....well in california that is!
