air is part of the egr (exhaust gas recirculator) system. what the system does is take a small portion of your exhaust gases and recirculate it into the piston chambers. it helps the vehicles pass emission tests, and according to gm, decreased combustion chamber temperatures. many people remove it to simply clean up the engine bay. no performance gain, just loose a 1/4 pound.
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2000 white C5
blackwing intake/descreened maf
ported & polished throttle body
160 hypertech stat
taylor thundervolt wires
tb coolant bypass
slp short tube headers
borla quad stingers
anti-venom/tampa tune
cross drilled and slotted rotors
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