If you're tuning by color spend the money and get a colortune plug, way more accurate
http://www.gunson.co.uk/tech-torque/Colortune-See-inside-the-combustion-chamber
If you're tuning by color spend the money and get a colortune plug, way more accurate
http://www.gunson.co.uk/tech-torque/Colortune-See-inside-the-combustion-chamber
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