when it comes to grounding kits.. hmmmm.. it's been around for ages. i've done 0g grounding including RF Fosgate big 3 upgrades since year 2000, that's like 10yrs ago. when it comes to adding small caps (or similar devices) as voltage stabilization, it can be tricky to tell if those caps still function after a yr of use under extreme engine heat. most of the time putting in on and off, gives only marginal difference.
however, when it comes to vs for better sounding car audio, the use of a variety and concoction of caps in the power supply chain can help achieve desirable and very audible difference which the powerful human ear can differentiate.
