OK sorry I said that wrong, I did not mean heat range as in different heat ranges for spark plugs, I meant the intensity of my spark/NGKs gapped at .042. Not saying that was the only thing that bump up my performance. It was there the whole time with my existing mods. Yes bigger TB, TB spacer, Catback, magnaflow, accel coil and wires, NGKs, cold air intake. other little stuff like insulated air tube etc etc. Yeah I dont feel the gain just from a bigger gap of .002 alone. It is in conjuction with my existing mods. Brought the existing mods to full potential. Also along with getting a little more air from the modified 62mm TB along with the bigger spark plug gap. My lil power plant squeezing and utilizing every bit of juice it has at this current set up. So It feels like a big difference when every thing is tuned and adjusted and tweeked just right. Like for example how can a 42,000 volt coil be at full hot spark if the spark plug gap is to small. All I am saying its all working in sync at full potential and I can feel the difference. Thats a good thing right.