I thought the turn downs were a noise control thing, not emissions
Exactly, along with a dual snorkel "silenced" air filter cover on most vehicles.
What year were the ca cars sold like this? I thought 69, but I’ve seen something’s suggesting it was 1970. With the dual snorkel and the turndowns that is.
My '69 LA built and LA area (Norwalk, CA) originally sold GTX had a dual snorkel air cleaner cover and no exhaust tips. Sure it was '69 and then in 1970+ California EVAP required the snorkels have vacuum closures to minimize carburetor float bowl fumes from exiting out the air filter cover inlets (snorkels) and the closing hood scoops when the engine was turned off (no vacuum).
(I have since put an unsilenced air filter cover on the GTX and exhaust tips)
