Sounds like they are selling a voltage conditioner ... only problem is the car is designed and can handle fluctuating electrical currents that is what the voltage regulator is for, no matter if it is in the alternator or mounted on the firewall you are covered ... If you are getting electrical noise through your car stereo speakers this may help eliminate that... but so would a new set of spiral wound spark plug wires
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2012 Chevrolet Traverse *active*
2002 Oldsmobile Alero GLS *active*
2002 S10 2wd p/u 139,000mi. *active*
1975 Corvette Stingray *active*
1994 Camaro Z28 Convertible 149k *Sold 2013*
1998 Blazer ZR2 189k *Sold 2012*
1995 Tahoe LT 250k *Sold 2011*
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