I had Leeches on mine for a while. When they finally wore out, I bought a set of TRU-Ball Speed balls and used them alone. I not only could not detect any more noise than with the leeches, but I picked up 5 fps as well. TRU-Ball also makes a spider that has the speed ball in it as well as silencing spider legs--best of both worlds.

The most important bloodtrail leads right to the foot of the cross