Like many of you, my bypass valve would rattle at idle. I tried adjusting the preload tension, but to no avail. I ended up installing a capristo twin sound for a while. While the twin sound was on my car, I figured I'd cut into my bypass since i considered in junk anyway. I had seen another valve cut open up here, it used a single ball bearing to center the shaft, mine was different, The cap contains a spring that holds a ceramic cone that centers the shaft. I initially tried to copy the capristo design, I bought 10 ceramic bearings and used the spring and a washer to press against them. This worked for a little while, but ended up seizing. So i gave up on modifying it and installed cleaned it up really good. I used some light sandpaper to remove carbon buildup so the ceramic cone fit in the valve housing better. I then used graphite dust to lube it thoroughly and reinstalled. I've been using it for 3 months now, no rattles. Might be worth a shot before buying a new one. Image Unavailable, Please Login Image Unavailable, Please Login
