Ephedrine is as much a “fat burner” as clenbuterol or yohimbine, given that they have similar mechanisms of action. They all work on the adrenergic receptors in fatty tissue, increasing the breakdown thereof somewhat. Yohimbine is more selective for the alpha-receptors, clenbuterol is selective for the beta receptors, and ephedrine stimulates them all.
The boost in metabolism isn’t very significant, if that’s what you want just take t3. In my opinion the fat burning effects of ephedrine are as follows, listed in order of significance:
1) appetite suppression
2) stimulant effects
3) induced insulin resistance
4) lipolytic effects on the body’s fat stores