if you get the digital 6, mount it inside the car. not under the hood. mine gave me fits with electrical noise and still couldn't get rid of some issues mounted in the cabin, but fewer than under the hood.
I would look at ICE 7amp box. I think you would love it. mine works great.
FAST has a new 6amp box and Daytona sensors has an interesting 6amp box. I hear crane has some nice stuff now too. a lot of choices out there. me personally, i'd stay away from that digital 6 box. a lot of issues their. just go on MSD site and look in troubleshooting digital 6 and you'll see what I mean.