I was just curious of some fairly easy and cheap upgrades i could do to improve fuel efficiency and power. I know in the diesel world chips make a huge difference. I know that they make them for gas engines but i do not know anyone who has had or tested them on gas engines. What are some of your guys opinions on chips. I have also considered MPFI t spacers because they are supposed to give you a better fuel air mix for better efficiency while giving you little bit more power. I have a 1999 k1500 with a 5.7 and any help would be appreciated. ---------- Post added at 11:45 AM ---------- Previous post was at 11:25 AM ---------- my next question would be is a vortec 350 considered a Multi port fuel injection system or a Central SFI system.