8.5mm and 11mm FireWire® • Now only 25 Ohm per foot resistance – lowest in the industry! (8.5mm only) • Double-silicone reactive core spark plug wire sets. Up to 50% more spark energy! FireWire’s low 25 Ohm-per-foot resistance transmits up to 50% more energy to the spark plugs than other “performance” suppression core wires. • 8.5mm pure silicone double-layer construction! Our 8.5mm “silicone-on-silicone” design resists high underhood temperatures and insulation breakdown caused by abrasion. Designed for use on tube-steel header equipped racing engines! • State-of-the-art “reactive core” filters RFI! FireWires actually filter out RFI and EMI noise generated by today’s high-output ignition systems, protecting on-board computer systems and instruments! High performance 550 degree boots! 8.5mm Sleeved FireWire® • Racing-design, braided, fiberglass sleeving offers an extra barrier layer of protection against abrasion and extreme heat up to 1200° F. • The ultimate spark plug wire for drag racing, oval track, road racing, marine or serious street performance! • Exclusive Reactive-Core design actually filters RFI “noise” from the highest-output electronic ignition systems. • Kevlar® reinforced with braided fiberglass mesh for added strength and protection. • Pure silicone outer jacket features a double-layer of protection against extreme heat and underhood fluids. • Available for small-block and big-block, over and under valve covers. Black only. Pre-terminated custom sets for specific engine applications or universal cut-to-fit sets. 11mm FireWire® • The ultimate 11mm spark plug wire for all-out performance applications! • Exclusive Reactive-Core design filters RFI “noise” from electronic ignitions. • Reinforced internally with Kevlar® braided fiberglass mesh for added strength and protection. • Delivers maximum spark energy output to the spark plugs with today’s extreme high-output ignitions. • Triple-layer, pure silicone outer jacket for maximum protection against extreme heat and underhood fluids. • Available in universal cut-to-fit sets, for popular U.S. V-8 engines (non-sleeved).