Clenbuterol, in my opinion, is a step above EC. Mix clen with caffeine for best results. I have tried EC and clen at the same time, and that is effective too.
stack 1: 40mg ephedrine, 400mg caffeine, 2-3g of l-tyrosine
stack 2: 140mcg clenbuterol, 400mg caffeine
stack 3: 120mcg clenbuterol, 20mg ephedrine, 400mg caffeine, 2g l-tyrosine, and be careful...
Don't even bother with high GI carbs after workouts on stack 2 or 3. Glycogen synthesis is totally impaired by clen. It is a good anticatabolic and has a nice smoothness to it, though.
I would like to try working out on amphetamine, but the only access to amphetamine I have is at clubs, and I'm never sure what mix is in those pills.