I don't remember the car, but I saw a dyno test where adding additional ground wires added a few HP. It also reportedly improved response. I guess maybe you're all not crazy. 
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‘07 Mazda RX8
Past: 911T, 911SC, Carrera, 951s, 955, 996s, 987s, 986s, 997s, BMW 5x, C36, C63, XJR, S8, Maserati Coupe, GT500, etc
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