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Originally Posted by Mark-5.7
Does the mesh thing affect emissions output or do you mean that they physically check the air box for this mesh filter? It seems like it would impede air flow?
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It doesn't effect emissions output so it won't be missed during tailpipe testing. It's there to trap fuel vapors from backing out through the intake and venting to the apmoshpere. However, some states are required to visually check all emission control devices are in place (Cali is one of the worst). So depending on where you live, they will check to see if the carbon filter is there. And yes, it does impede air flow somewhat.