Throwdown wrote:Confirming, the i4 only includes one gasket and that's all thats needed. The one side you cannot use a thermal gasket because it uses a o-ring type gasket due to the design of the oem connection. They are a few hp gain at peak but nothing major for the 80 bucks they are, shows typically as a bit more throttle response.
If experiencing a whistle I'd recommend to also check to ensure no leaks from the tap and everything is sealed well.
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