I've seen amazing results with a grounding kit on my other custom turbo car with a high output ignition. Mainly because the stock grounding setup wasn't sufficient to support that much ignition energy.
For our cars, it's not worth it until the stock electrical system starts to degrade.
I'll tell you what, though. I'm going to pull the grounding kit off my other car, install it on the Z... not tell my wife, and if she notices better shifting on the 7AT, I'll know it was worth it.
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