Have orderd the spark plugs from ford today for my saph cos 4x4? Now what gap size should i set them at? I believe for a stage 3 its around .6mm but whats best for standard?
The reason why im changing is that im experiencing splutter's on boost? Now ive cleaned all plugs and changed the the coil to a group A etc so giving the sparks ago

Any other idea's?

Cheers peep's