steve@az
+1y
PAIR tubes - Pulsed Air Injection - basically it injects fresh air into the exhaust stream to help with emissions. Other vehicles of the era were equipped with a belt driven air pump, Mazda was clever enough to design something that didn't take extra power from the engine...
It can be disabled/plugged/removed with no ill effects on how it runs. However, you would no longer pass a visual inspection for emissions (if you have emissions testing).