Fast Coil, Xr Series For 2005-15 4.8L/5.3L/6.0/6.2/7.0 Gm-Ls Gen Iv Car & Truck Engines

XR Series ignition coil for ''05-'15 GM 4.8, 5.3 and 6.0 trucks provides up to 15-20% more energy over stock ignition coils.Built from ultra-pure copper alloy windings, our coils have been tested to 8,000+ RPM and 1,500 HP.