I agree that it will probably be small. Depends on the condition of your car. But if its not worth it, why does anyone mod NA's? How much it helps is not always the point. It all adds up. Here's how it will work though. When the grounds start to oxidize you will develop a voltage drop across the ground wires. Ever notice that a wire is hot? Thats because there is a voltage drop across that wire. At higher currents, it gets worse. Even a .1 of a volt will affect the car. Keep in mind that using Ohm's law, it only takes a resistance of 0.01 Ohms to develop a .1V drop at 10 amps. You might want to think about that before anyone flames this guy. I wouldnt buy one of those premade kits. Too much damn money. I'd just go pick up some good braded wires and start adding grounds. Its too easy to not do.
