I've been searchin the forums but no luck. I just bought an E-fan and Im trying to figure out which connector the pin 42 and pin 33 are in, red or blue. I have a 2001 Silverado does this link for the 2001 LS1 PCM work? http://www.ls1tech.com/forums/showthread.php?t=312119 Also would Allen have turned these pins on if I didnt have E-fans at the time? May need to get him to change it when I get my retune at the end of the month.