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Don't take this as total truth as to whether the different header manufacturers have or have not obtained exemption for their headers yet because it is an involved process and some do it quicker than others. Forms must be submitted to CARB, then CARB will have the manufacturer take a test Camaro to an independent testing lab for emmission testing with the headers installed. Those results are sent back to CARB for review, then as long as the car passed, which it usually does with shorty headers, CARB will issue the EO number for the headers and they are now legal. This process is expensive and takes SEVERAL months. Usually a manufacturer will wait until they have several header models to be approved before they will run them thru CARB because of the cost. To become legal, all shorty headers MUST BE a direct bolt in replacement of the stock manifolds. NO modifications are allowed. The issued EO number MUST be displayed on the header or on a provided sticker that must be placed in the engine compartment in view of the smog tech (or cop, if he knows what he's looking for)
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