So I just got done with it, on my limited. I can say the hardest part was swapping the connectors over, as the e55 one I got was covered in some expoy/sealant type deal that made it impossible to get to, so i just clamped it in a vice and took a screwdrive and bfh to it and eventually got everything off.

And yes, you do have to swap the boards, because the supercharged motors have different boards, the na's are tagged with a 10, the supercharged with an 8. Both use different trace lengths on the board.

So far I havent driven it, but it does rev a bit faster, sounds a wee bit throatier as well.

Driving impressions tomorrow