Description Best plug to run for NZ conditions. O.S. P3 Gold “Ultra Hot” Turbo Glow Plug glow plugs have always been tough enough to take the heat and Speed P3 and P4 Gold Turbo Plugs with 24K gold plating take O.S. innovation to new levels! They’re the perfect complement for .18-.28 cu. in. turbo head off-road racing engines. The gleaming gold appearance makes these plugs really stand out, while commemorating O.S’s 80th anniversary. Even more important, Speed P3 and P4 plugs boast many performance upgrades.
