Top off your Ford or GM Ignition system with these great new replacement coils. The Blaster TFI and GM Coils have MSD performance in factory style housings!MSD designed these Coils by combining our Blaster Coil experience with E-core coil efficiency. Each coil has a unique turns ratio plus there is lower primary resistance than the stock coil. This all amounts to a bolt-in replacement coil that produces more output voltage. The Coils will work with stock ignition systems as well as MSD equipped cars and trucks. Installation Tip: If you plan to install an MSD Ignition with your Blaster TFI Coil, use a PN 8874 Harness for a direct plug-in installation. Features: Direct performance replacement for Ford TFI coil85: 1 turns ratio and lower primary resistance produce high voltage outputWorks with stock ignition as well as MSD IgnitionsCARB E. O. ApprovedPit Stop USA offers MSD Blaster TFI Ignition Coil 8227 at low everyday prices. Be sure to check out all of our products from MSD including MSD Ignition Coils.