I have a 90 civic dx 4 door that has the basic mods like a tenzo r exhaust, ractive ram air intake, denso spark plugs and ractive wires but I heard that if you swap a 88-91 civic Si fuel injector in it to replace the programable fuel injector, its the most efficent HP gain. Is this true, and how much am I looking at to spend on this? Does Anyone know [/url]