Glow Plugs

Ultimate Racings P3 and P4 Glow Plugs are the same as those offered by O.S. They are perfect for Ultimate Racings M Line of engines and any O.S based engine, although they will fit all engines with a turbo plug. Generally, Hot plugs promote better idling and acceleration, whilst Cold plugs produce more power and may improve performance if your engine runs hot. The downside is rougher idling and more difficulty in tuning.