Reviving an old thread so people searching for a solution can easily find it. I have found the best solution for quieting a BOV to almost no sound at all and enough flow so you don't get compressor surge. This works with my Procharger D1X setup at 15psi. I have a Procharger Big Red Bypass venting to atmosphere through a "Pneumatic Muffler", instead of a small K&N like most try. You need to find a muffler with the largest CFM rating. I use the Mini Muff. I attached it to my BPV with a 2" to 2.375" silicone coupler. The 2" NPT connection on the muffler is just under 2.375" diam. The end caps are aluminum and the filter element is a bronze screen so no need to worry if the element gets wet!
quieting down a bypass valve
other than routing it back into the intake, does anyone know of a good way to quiet down a bypass valve? i'm using two procharger bypasses and they are ridiculous, it sounds like i'm driving a jet around. i like the sound and stuff but it gets old real quick. i was thinking about merging the two...
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