I have receipts for the motor build, not much else. With the cat reinstalled, the car SHOULD pass idle emissions, there is no CE light. We don't have emissions testing here, so I cant be sure. It does need the rear O2 sensor replaced. I have a new one, just haven't installed it yet. Don't know how I could certify the ECU other that show Delta dash (included) working and to change the idle, it wont do that with a stock ECU.