O.S. - #P4 Speed Plug Super Hot Off-Road image

O.S. - #P4 Speed Plug Super Hot Off-Road

Manufacturer: O.S Engines Product Code: 71642730

#P4 Speed Plug Super Hot Off-Road

Available - Ships in 2-5 Business Days

The O.S. P4 Gold "Super 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.


  • Easier to tune
  • More low-to-middle range power
  • Quicker throttle response
  • Faster acceleration
  • Better mileage
  • Crisper idling, with a difference you can hear
  • Increased longevity
  • Speed P4 ideal for ultra-hot applications; Speed P4 ideal for super-hot applications