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The little door on the air box only closes for noise reasons. The intake on the car is pretty loud. That is why there is two resonators, and the door that opens at higher rpm. It feels good, like I said, the intake sounds very powerful on the car. Seems to have an easier time reving out with the intake, however I have not dynoed the car to see any real gains. It is a pretty straight shot from the air filter to the throttle body though, so it is obviously breathing better. Just a note on the ehxaust, from the headers on back, this is a pretty straigh system. One cat, then a resonator, two bends and a muffler. I doubt that there is much restriction other than the muffler.
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