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the CAI wont make the light come on. the codes are from the rear O2 sensors (like 06monteSS stated) ALL Long Tube headers change the position of the rear O2 sensors. As a result, they dont heat up as much as they should (they require a certain temp to work properly) and the AF ratio will be adversely affected. The only way to fix this is with a tune that will turn off the rear O2 sensors all together. DONT GO CHEAP AND LOOK FOR O2 SIMULATORS AS IM SURE WILL BE ON THE MARKET FOR THESE CARS SOON. Simulators will make your engine go lean an that can damage the engine.
listen the Ted from Jannetty and 06MonteSS and fork out the ~$500 for the tune. If you already forked out close to $3K for headers, full exhaust, and CAI, finish the job correctly and invest in the tune to properly adjust the car. Your car will be happy and reward you!
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