yes its called Secondary Air Injection that your car came with it basically runs for like the first 30 seconds you turn your car on a blows airthrough the system cleaning out any built up gases or other things when you shut your car off. It creats like a loud hiss and whistling sound when it is running. I took that black piece and put it on the lil black knob thing that is right above it ... you can almost see it in that pic its like at the top left of the picture almost near the middle. Some people remove it completly
Secondary Air Injection
In Late model 2006 and up models of the L61 level cobalts, GM implemented a system called SAI or Secondary Air Injection. SAI is basically an emissions conrtol device and is basically a hose after the MAF and before the throttle body connection to the engine on a small port. Basically (from what I understand) air comes into the intake from the filter, up the intake piping and the SAI takes some of that air and pumps that to mix with the exaust fumes to affectively lower the emissions. It's important to note when buying an intake system if you have SAI or not.
Mod's So Far: AEM CAI, C.A. Header, 2.50 Magnaflow Catback Exhaust , ZZP Catless Downpipe, DC Carbon Strut Bar, Dropped on Progress Springs. Tinted, Fully Debadged, Custom front SS bumper,2 Audiobahn 10" w/JL amp, Lower Billett Grille, Sengen 18 x 8 rims wrapped in Capitol Sport UHP 225/40/18.
Last edited by Chester; 02-02-2009 at 02:05 PM.