Our Pro Series 60,000 volt coils provide 40,000 more volts than factory coils, ideal for supercharged, turbo and nitrous applications where spark blowout from weak factory coils is common. 0 Ohm resistance, no RFI / EMI interference thanks to patented protector ring. 3 different stages available (OEM Replacement, MPG Plus, Hot Street, Pro Series, and Pro Series Extreme). When you are ready for more power, check out our 2005+ Mustang Exhaust Kits and 2005+ Mustang Cold air intakes.