I'm just about finished with my leak test. Everything turned out fine, except my pump is loud as hell. It makes a terrible high pitch whining, like a flourecent light on steriods. Could it be the way I mounted it? It's a Corsair mcp355. I didn't have the pad for the bottom, so I just used some epoxy to mount the bracket solid. Doesn't sound like vibrations, however, just a high pitch whine. I tried unscrewing it and just holding it in my hand, not much of a difference. Perhaps 355's just eminate an unpleasant sound.