Only the bottom of the ST200 box is what is different from stock. The top is the same as the one that came from the factory so this still should improve airflow with the different top matched to the ST200 bottom. But like I said is it even worth it as far as additional air flow gained. Someone would have to test it to see. I'm happy with my ST200 box. Open my hood and it looks completely stock and I like it that way. Stealthy
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Also why I will not change out the intake/crossover hoses/piping for aftermarket versions either, unless I go bigger turbo and they become a choke point for flow.