97 GMC 6.5t "S" 287km Z71 3" exhause no CAT 4l80E + HD transmission cooling from fact, 3.73 axel, new injectors sept 4th, newer glow plug, IP PMD mounted , Gutted Plenum, EGR Block Off,replace IP in 2000, new PMD mounted on skid plate,home made TM, boost gauge