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I'm sorry but I don't believe butt dynoes..no offense. There have been members on here that have actually dyoed their cars and they lost hp with the EVO system which makes sense because it is not a cold air intake like the stock system.
The shield on the EVO isn't sealed and doesn't block out all the warm engine air. You could've saved yourself $400 and just desnorkled for free....even though the stock intake sound is pretty damn loud and good.
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