Dont know about the rules and regs so much.. but when I bought my car it already had the pod on it... I had to look about the engine bay a bit more than I had ever done previously and found that although there was a pod installed the original box that it was installed into had the original air opening of just on 2.5 inches.. so not that much more air would have been able to get in anyway... I need to do something about that...

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