This is the location to install the Boss Performance chip. Don't know how it works exactly but it did give my truck a boost in power before I decided to do it right. Flea bay product... well worth $30 bones
DIESEL CHIP TUNER 2006 FORD F-350 6.0L POWERSTROKE on eBay.ca (item 390085338644 end time 30-Aug-09 17:15:31 EDT)