FMS (Ford MotorSport). The only effect it will have on highway driving is your R's will be up about 500 or so. You'll lose a little top end MPH, but do you really plan on doing 130. You'll also find if you are a 5 speed, you'll use fifth a little more in places you normally wouldn't have. You gas milaege might suffer a tiny bit, but with the extra push you'll get at the bottom end it is well worth it.
You will also have to get a speed compensator with the gears. There is no speedo gear to correct speedometer on the 99/00's. I use an Abbott ERA also I have head good things about the one from Sean Hyland.
You can get both the gears and speedo compensator from Houston Performance.
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