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Originally Posted by BlackBulletTSi
some dude I ran into like twice already mentioned something about gaining 2PSI if I take the tube off of my blow off valve and capping it.
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If he is telling you to cap the BOV then it is possible you might gain 2 psi because the stock 1g BOV might leak a little. But then you are running without a BOV which is problematic for several other reasons. You are better off increasing the spring tension on the BOV by modding it.
If he is telling you to pull the tube off, capping the dump port back into the intake pipe and letting the BOV run vented to atmosphere then he has no idea how DSMs work.
Stock, our cars have a mass air flow meter that counts air going through it. When the BOV dumps to atmosphere that air is then lost without the ecu knowing about it and the car runs rich. This will cause driveability problems including hesitation btw shifts and possibly the car stalling as you depress the clutch coming to a stop. And it will not gain you 2psi of boost.
For your car leave it stock. Mitsu engineers know more than this guy.