OS SPEED edition of the P4 plug with 24k Gold coating.
This special Speed version of the OS P4 glowplug is plated in 24K gold. But the gold is not just for added for cosmetic 'bling' as the gold plating was chosen for its thermal characteristics in order to improve throttle response in medium and low speed ranges over a standard plug.
Features:
- 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 Super hot applications;
The OS P4 Plug is well suited to a wide vareity of engines, specifically those OS based .21s such as V Spec and later VZ-B and XZ-B as well as B2101 and B2102.
Also used in the SPower S3 and S7 as well as the Bullit B216, 217, 218, 219 and later B220 and B221.