probably not sound, but there is proof that there is some gains with this set-up. I was just discussing this with another member here and the only dynos we have seen have been ones where other mods had already been added, so with a stock set-up it's very hard to tell. I would go with Modshacks DIY fang vents if you do go with it though... that's what i'm going to do. Cool air is better air.
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