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Even 10% more fuel will decrease power if it isn't needed. Get two O2 meters and mount them to your A-piller, one for each sensor. If thwe meters read red or orange for longer then 1 second while at full throttle then you need more fuel. Yes new injectors will generally perform better then old ones because they are clean. Ford motorsport injectors are a good choice because of their spray pattern, but just aftermarket injectors aren't really any different then stock. Find out what size injector the legend uses probably 19 or 24lb. Also find out what style, I think it's Bosch but double check. This will help when looking for injectors as they usually won't say, "fits legend." Internal mods, superchargers and turbos and nitrous are what requires more fuel. But the fuel has to be increased only when needed not all the time. Internal mods are high compression pistons, port and polish,etc. Pulleys and aluminum flywheels won't require more fuel. If you are looking for more power speed, make sure you drive a 5 speed to start and then consider swapping in a JDM motor. Also nos is nice for that added boost of power.
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88L Coupe ,JDM motor, 5 Speed swap, and 2.25"exhaust, milage computer, custom down pipes from manifolds, real CAI, Accel Super Coil, 182k miles on the body. New black leather and small grant racing steering wheel. Port and polished intake manifold without butterflys and rebuilt 5 speed.
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