Hi

I found this website that advertises a computer chip upgrade :

CHRYSLER CROSSFIRE G-Force Peformance Chip

It's one of those things that sounds too good to be true. After digging around a little bit I also noticed on the left-hand side that you can get upgraded computer chips for cars like a '63 Triumph Spitfire, a '57 Desoto and an Amphicar - all cars that didn't have computers to begin with.....
So I thought I'd post here and ask if anyone knows anything about these chips or if anyone knows anything about a reputable computer chip upgrade ?

I'm not really looking for more power - that'd be nice but I like the better gas mileage and lower emissions aspect of a chip. Does anyone have a suggestions for a chip that will help me out with emissions and mileage and maybe even more power ?

Thank you,

Dave