Originally Posted by bfranks

The one you want is the top one listed. The other three "tiered" ones are for the older models I believe. As for the install. I guess it depends. It involves removing the control board and soldering onto it. Kevin (guy that builds these) had mentioned doing some sort of swap out (he sends you a board pre-wired for a core charge, and you send back your baord and get the core charge back). Not sure if he ever started that, but worth asking. I'll try to find the link to the install and post it up.....let you decide for yourself.

Edit: Here is the link.