What is this?
AIR - Air Injection Recirculation - Emissions controll device. Injects fresh air into the exhaust gas before the cats. Helps them heat up to reach "emissions light off" faster.
Removal Pro's:
Weight, clean bay, no more annoying sound on startup, spare rubber hose to use on other stuff.
Removal Con's:
Only worry about VERY strict visuals (read: California) causing failure. Sniffer test can only tell before car is warmed up. After car reaches operating temp, the AIR pump shuts off and becomes useless. SES light will come on if system is removed unless codes are tuned out. Blockoff plates for exhaust manifolds required unless using "race" headers.

