The thing that lobux left out is that when you raise the redline you also raise heat. Meaning that you need a better cooling system if you plan to keep it up very long. Second, you will find that the bottom end also needs to be well balanced in order to keep the engine together. The oiling system also needs to work well or things will seize up. Most small import engines are well balanced and the cooling system usually works very well. Raising the redline is dangerous thats why its there. Toyota knows what they are doing. However that doesnt stop us racers. Just know that most real race engines are torn apart ever ten runs or so. Even the good ones. Doing all this head work and changing the redline is great But keep in mind the bottom end is just as important as the top end. My friend runs a power programmer on his truck. Mostly its for changing the top speed and for changing shift points, tire sizes, ect to make it pull or race better. However it only changes these things and not the overall power. You may see small gains from changing the fuel to air ratio buts thats about it. This may be what your freind feel.