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does that grounding kit really makes that big of a difference? I really cant see how a few grounding wires can make a huge difference. Im very skeptical when it comes to more hp from a few wires. I understand if its a lightened pulley or and intake and exhaust, etc.... but a few wires?
Its not HP that you gain, its throttle response, and smoother shift transitions. Take this for thought, when you stomp the pedal, while very short it still takes time for that signal to register with the ECU as "Go fast, and go now!" The grounding kit speeds up every translation of your input to the cars ECU, so that will make the throttle respond faster to you pushing down combined with a faster, smoother shift does make the vehicle slightly faster. But not because you've gained HP.