This has a rear sump pan and a windage tray. We had to heat and bend the rear sump pickup a bit to get the tube to clear the windage tray and still stay off the bottom of the pan. I wonder if at specific engine speeds the oil pump pickup is oscillating and hitting the windage tray. That pickup is a snake-y thing and I could see it doing that. But even if it did I doubt it would be loud enough for me to hear.
