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OK, after some experimentation, I have come up with 2 ways to maximise performance of these nology plugs and you can confirm feel them when you install back the plugs. 1. Side gaping. The classic side gapping. Just take a file and slow file away part of the ground tip to expose the center electrode. 2. Increase gap. I realies the Nology plugs have very small gaping. Whats the point of having more powerful sparks with the gap is so small? I increase it to 0.030" (0.75mm). The low end power is immediately obvious. The car ran much smoother even with aircon on can I can shift at just 1.8K RPM with hardly any vibration on engine going uphill (its just a gentle slope near my house but I gone thru it countless times to test low end). High end is also better can feel the car accelerating faster than before w/o flooring. However, the plugs have one side effect, it doesn't work well for Turbo engines. My Denso are running at 0.8mm gap and I don't have misfiring problems at 5K RPM. However, the nology start misfiring at around 4K RPM if I floor the accelerator (even when I have a MSD coil) I have yet to reduce the gap as I am too lazy to take out the plugs again. NA cars shouldn't have such problem because you will never go above 0 bar. I have a new much more powerful CDI coil and N&W CDI Pro 10 coming so I will see if it can overcome this misfiring issue. Will update again. So is Nology worth it? Thats the big big question. My answer is........ well.......fairly ok. IF you want to eek up every ounce of performance out of your engine, its worth spending the money and its cheaper investment than going CDI and new coils. Btw, the same mods applies to all other plugs as well. It doesn't mean you need a nology in order to side gap it and adjust the gaping. I believe if I increase my Denso to 1mm gap, I may achieve the performance close to the Nology but I may have misfiring problems as well. Well, there is no best of both worlds.