My buudy has 7.3 with about 130k on it. He is thinking of making a few mods. He wants to try and improve the milage. I don't know anything about the 7.3. I have one of the other diesel products not mentioned to much on this site. Would the same logic apply. Edge box, new chip, new air cleaner system, exhaust, F.A.S.S., etc? Any sugestions would be helpful.

Thanks,
cjthor