Registration of vintage vehicle need not comply with the Clean Air Act

Dear PAO,

My fascination for old or vintage cars started last month. I have been watching these cars which were featured on social media until somebody offered me a vintage car which is still in pristine condition. I am planning to buy the said vintage car, but my best friend discouraged me from doing so since one of the requirements for car registration nowadays is that the car must be compliant with the provisions of the Clean Air Act. Can I register the car even if it does not comply with the provisions of the Clean Air Act?