Bests & Worsts Reviews from Amazon

As a mechanical engineer that has worked with EMP devices, I can tell you, first-hand, that EMP is not a 'direct effect' event, like touching an electrical outlet and being shocked. It is a 'disbursed event', happening much like you see a rainstorm...but at the electron level. This is why 'actual EMP protection' is cage-encompassing. If you took a cell phone, and suspended it in a 1/4" welded wire cage (think 'rabbit cage') by rubber bands, then grounded the cage to 'earth', the EMP cascade would follow the lowest impedance path to ground...it would 'circle the cage' and 'avoid the high impedance path through the phone'. Military applications of this are often seen on aircraft, where the fuselage is aluminum. Seldom noticed, there is a 'grounding strap' (pure copper, much like a cable) that is deployed before landing. It 'drags on the ground' before the tires even touch down. This allows for the ionic charge to dissipate to ground first...and to attempt to disembark the craft without this 'grounding' can and possibly will lead to sufficient electrical shock to cause death. While this deals with 'static charge', the same forces and 'charge direction' occurs much the same way, with the same structural components...only isolation capacitance and diodes are used to prevent 'complete system charges' from building, and allows for 'electronic isolation' combined with 'frame caging' to prevent EMP from affecting 'otherwise-sensitive' components. NONE OF THIS IS BUILT INTO A CONSUMER VEHICLE! So, when you 'wire in a capacitor' or diode to your car, even when grounded, it may assist in dissipating 'static charges', but there are no 'EMP cages' protecting your alternator, starter, ECM, etc. on that car! They are not protected. Sure, this device is tested...but as you know they did NOT test it on your specific model, they CANNOT ATTEST to the fact that it will provide ANY EMP to your car...simply that the device itself is a cage, with capacitance ability and directional grounding, to dissipate FOR ITSELF (in otherwords, it is protected...but what you mounted it to is not, unless it was ALREADY EMP CAGED!)... Does this work? Their tests show it does...TO PROTECT ITSELF. Can it protect your 2010 Camaro, or 2012 Mustang or 2018 Silverado? Who knows? They don't...they didn't test it PER MODEL APPLICATION! (the answer is no, by the way...it won't). Caveat Emptor...buyer beware...