It works well on ECU, I found it helped, and ran smoother. Its all about path to earth, and on these cars its poor due to connections are on paint so no really connection.
But there isn't a massive difference, I think a lot of people expect to much.
I am a sparky, and we put earthing in for a reason, all about disconnection times, less resistance, quicker times. Does nothing, but under fault conditions will do its job.
Same sort of thing I guess with earthing kits. I am not up with car wiring though.
Right sorry to bore. Peace out.
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