the Type-S is a great CBV.. great sound, dischages plent of air, and easily adjustable.. just dont TURN THE NUT to adjust it... ive seen too many ill-informed people who turn the nut trying to adjust the spring tension only strip out the threads on the housing that hold the stud. the nut is the lock nut, you back it off. then turn the stud w/ an allen wrench in the direction you desire, according to the sticker on the top. harder means it puts more tension on the spring, and itll stay closed longer under higher boost. you can even adjust the CBV to stay closed at idle, like a H-K-Dollar sign SSQV. It also changes the sound.

itll hold more boost than your engine can safely run... lets leave it at that

oh, btw, the top nipple is the one you use for the Vaccum signal, it places a vaccum on the top side of the diphragm. since the Type-S is a pull-type valve, when the vaccum is high enough to overcome the spring pressure, it sucks the diaphragm up, and then the rod, and the valve attached to the end of it. this opens the CBV and allows air to discharge back into the intake. the BOTTOM nipple is not supposed to be used, since its BELOW the diphraghm. when your engine is not boosting, it would create a vaccum BELOW the diaphragm, and try to pull it down, which would force the rod connected to the valve down, and hold it shut under vaccum, which is BAD. when you shift, your engine sees Peak vaccum, and if the CBV sees it, the valve will stay closed and youll surge. The bottom nipple is SUPPOSED to just be a vent, so the air under the diaphragm can circulate in and out as the Diaphragm moves up and down when you shift. if it was sealed, the diaphragm wouldnt be able to move, just like if you leave the cap on your 20oz Dew bottle, you cant squeeze it, but if you take the cap off, you can squeeze it cuz the air is able to vent out the top. know what i mean?