Now when you say "increase the car performance" - yes it does. Electrical performance. Whether that translates into speed/torque/power I don't know. It really depends on the age of the car, how good is the ground, etc.
Was wondering how can u tell that your fuel pump is about to "kaput". How much does it cost for an Evo 3 fuel pump and where could i get it from? Another thing my car jerks at high rpm esp 6.5k and misfires quite...