I'm not totally 100% sure, but I don't think all performance injectors would raise EGT's. I know more fuel will raise EGT's, but you can get injectors that due to a better spray pattern, will give you more power with the same amount of fuel. Though, if you go from stock to something signifigantly larger, say 100hp, you will notice a higher EGT. If you can get enough air though, you can bring those EGTs back down. Think of it like this, lean is cooler, rich is hotter.