ULTRA 40 sets the standard in high performance ignition wire. With optimized EMI (electro magnetic) and RFI (radio frequency) resistance, Moroso wire is used in the highest levels of racing from dual mag Top Fuel Cars thru NASCAR Sprint Cup Series. At 40 ohms of resistance per foot, our 8.65mm ULTRA 40 features a highly engineered, spiral-wound conductor that maximizes energy transfer and minimizes noise interference. ULTRA 40 Motorcycle Ignition Wire is the ultimate replacement wire for your ride.