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.
I ordered mine through Amazon. They were just getting their store set up I think. It still comes with everything you need to install. It might be quicker to call and order especially if you want a custom color if they still do that. I just ordered black and it took a week or two to ship but it was over the holidays.
Drained my RX can today after 333 miles and got 5oz or 2/3 cup of junk out. I am impresses and what the RX can takes out and surprised how much junk could be ingested.
Can anyone tell me where a Elite Engineering can mounts on the 5.3? I have looked here, googled it, and emailed Elite themselves to no avail. A picture would be great if anyone has one.