I deleted the neo plug in first post, as I could not find it on the nkg website, I've asked before but does anyone know what they are using in the Neo?, the $650 is for NEW stock coils in factory box.
It is confusing yes and with so many things that affect the firing properly I have learnt from this that the best way to track a problem is to check,
1. your coils for cracks and with a multimeter.
2. the plugs for useability and the right gap/heat for the boost you are running.
3. the fuel is the right Ron rating
4. the tuner did a good job of getting it right.
You can cover 123 easily enough but 4 is harder, it is more to do with the timing that is dialed in for the problem phase but would be a rare one I think. And to think all I wanted to know is what plug to use lol.