What is it?

heres a kit...

if boden says they are factory avail for the bigger trucks, that may be cheaper.

http://www.custombilletstore.com/product_p/5007.htm

sounds like you need a flash if running a factory ECU, and the big reports are possible MPG drop 1-2 mpg's if you care, and you may burn up a cat quicker if youre gonna run one...