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If your stock grounds were corroded and causing resistance, you could see a slight change. Upgraded grounding kits have shown tiny increases in horsepower on some cars, but high engine loads and high rpms is where you're drawing the most juice. IMO clean your existing grounds, use conductive grease on them and you should probably be fine. If you want to go the extra mile (and who here doesn't), throw a few extra wires between the engine and chassis. Don't spend $100 on a grounding kit that is just a pack of wire!!!
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