On the Hardracing website they have this link that says "929/954 myths" That talks about removing the HTEV and Intake Valve. Also they talk about all these power gains with their ram air tubes. Has anyone seen these? Can you buy them anywhere??
I have no flapper, or HTEV, and have not noticed much change in performance, it just sounds better and is a bit lighter. I also removed the PAIR valve, and it just cleaned things up a bit, and got rid of the popping sound when you decelerate.
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