OK I got an OBX BOV today while I was in portland OR for $50. Its easily adjustable by just rotating the top and is suppose to produce 115db.

ATX MTX swap, rear drum disc swap, drilled rotors, ported intake, optim throttle body, CAI, 7.5L MAF, adj. fuel regulator, longtube headers, underdrive pulley, no EGR, low inpedence bigger injectors, 2002 Focus Swap