my .02 cents on grounding kits based on my previous experience (Civic Si) was that i did notice better response from the throttle. At the time when i bought it i believe it was $10 I didn't really feel like it provided any additional benefit to my car but since i had it installed already i just left it. I thought the throttle response was improved but i didn't want to believe it because many time its a physiological thing.
It wasn't till i was about to sell the car did i remove all the grounding kit, that as i was driving my shifts were all off (that day the only thing i removed was my grounding kit). In a way i had to adjust my driving to match the car again.
I was planning to reinstall my old grounding wire kit to the BRZ this weekend just for kicks to see if it does help improve the throttle response.
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