Quote: OoOGazOoO "And in what way exactly...'"
It's an ergogenic, a stimulant and a bronchial dilator - it increases the metabolic rate helping to enhance the speed that muscle mass can be deposited and stimulates the release of adrenaline enabling the user to train harder and for longer.
If that's not performance enhancing I don't know what is.
You could argue the case on pseudoephedrine, but I'd say ephedrine itself is clearly performance enhancing.