RE: cen ct4s (how can i make it go faster - Acceleration!!!)
Mostly everyone recommend 20% but the current new motors are built to run 30% they have been engineered with thicker gold shims around the head just for this. I use to run 20% when I first got the car a year ago until they change in the gold shims. If you going to run 30% it's best to break it in with 30% wouldn't recommend going from a 20% to a 30% with changing the gold shim out and even then you will have to go through the break-in process all over again.