Pix of the plug
So how does it feel and most importantly are there any power gains from the butt dyno? I'll have to say the power increase while minimal can be felt. The plugs nicely complemented the K&N filter giving a better pull throughout the rev range. Perhaps the best satisfaction is when my tyre guy who drives Sentras everyday actually asked me if I did anything to the engine as my car accelerated better than a stock QG16DE. Still honestly I would say 1-2hp at the most for the plugs. This would mean about a 3hp increase for nearly 400 smackers. Blardy expensive but hey welcome to the world of trying to make power from an NA engine.