I could feel a vibration after installing my RX can also. I followed Newm's idea on page 24 and installed some rubber radiator hose pieces on each side of the mount and that took most of the vibration away. It was noticeable in the pedals at lower RPM's on the highway. http://www.gm-trucks.com/forums/topic/154204-oil-catch-can/page-24 I still have a slight vibration I can feel in the floor board at highway speed, but I attribute that to tires needing a balancing now.