I have a 94' F150. So far, i have shorty headers, true dual flowmaster exhaust, diablo computer chip and a k&n filter. I am afraid if i do any other mods like a new throttle body, injectors, and inake, that it will mess with the speed density system and screw everyhting up. I heard that you can get a kit to conver to mass air flow so you can play around more.......how difficult is a mass air flow conversion? Is it just the intake tubs and the computer with it? or is it more than that. Thnx for your help.
-Drew

 

The kit isn't hard at all - it's plug and play. You won't be able to use your chip with the kit though, since the computers are different. Unless you are making a load more horsepower, don't waste money on larger injectors. Your fuel requirement is the same as it was before, so bigger injectors won't gain you anything. The other things you have listed shouldn't cause any problems with the stock computer. When you start getting into cams and doing head work is when you might need to consider a mass air swap.