Thermostatic air cleaner inlets, electronic ignition, and electrically heated automatic chokes, along with a lot of other "innovations" were mandated in the late 1960's to comply with increasingly strict exhaust emission rules, particularly during the first 5 minutes or so after a cold start. "Cold air" systems like the infamous K&N and others like it cater to gullible customers who believe that slightly denser air drawn from ahead of the radiator can be fed a richer mixture for an imaginary increase in horsepower. In reality, the air is so cold that the fuel tries to condense back into a liquid in the manifold runners, if it ever manages to evaporate at all. Diesels or turbocharged gas engines are a different breed of cat- - - - -cooler air can and does make more power, but only under very specific circumstances. Turbocharged stovebolts are about as scarce as a chicken with lips- - - - - -and about as practical as a windshield wiper on a duck's butt!
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!