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.
Dudes, I'm experiencing power loss with my RS200 A/T. Frustrating when you get beat by Civics... I have got the throttle body clean and ECU checked for errors but nothing came up. The mechanic was saying that it...