Using race gas, and a race chip will unleash a whole different beast. The higher the octane, the more boost you are going to be able to run without knock. I was able to run about 22 psi of boost on VP 110 without knock when the track temperature was 138 degrees. I am going to go back to the track on the 26, and use VP C16. I have a friend who got 30+ lbs of boost on a pt52 turbo that made a 10 second pass and no knock on C16. The better the gas, the more power you can make, and the less chance of damaging you engine.