Colder NGK Plugs for XP Turbo Reduces the chance of detonation in higher boost motors Recommended with any BMP tuning, and especially over level 3 2 Plugs included Gaps are pre-set for the XPT motor These NGK plugs are a must have for your boosted XP turbo! Adding extra boost creates more heat which can cause detonation. Running a colder plug lessens the risk of detonation in your higher boost motor. We recommend using these plugs with any of our tunes especially when going above level 3. Gaps come pre-set for the XP turbo.