no good feed back yet as I just put a set in my 511 project. I have the IC837 and ICON told me they have a customer using those with 22# of boost. I bought them from CNC Motorsports for $499 per set. pins included.

http://www.youtube.com/watch?v=aIxaesJ190U

http://youtu.be/lCZAaN7fFLg