well i bought an mp8 box at the NFMS here about a month ago. its worked fine untill now. after i got my truck back from getting trans lines replaced my truck has been real sluggish like. ill turn it up and down and theres not a change in power atall. nomore smoke either, well jsut a little from my superchips. but anyway is thing like a fuse or something that could have blown to make it not work. i cant think of anything that would have messed it up. it hasnt worked since i got it back from the shop, but they only did the trans lines and im pretty sure they wouldnt have had to mess with it to work on the lines.