I installed my apexi grounding kit a while ago and did see a difference. My car would start alot faster and shifting was faster. My interior lighting would dim each time my bass would hit but it went away after installation. I also have a teck grounding kit to help. It also makes a good accent to your engine bay. i got mine for $150 before it was released but i think 150 was over priced. Oh well i love it.