First off, effedra and effedrine are legal again for now. They are trying to make them illegal again, but can be found online or in local stores pretty easily still.
Also, they aren't exactly a metabolic enhancer. The only thing they really speed up is your heart. Effedrine is just a stimulant of sorts. That's why "non effedrine" products contain CAFFINE and GUAHARA (however you spellit) as their active ingredients. They work the same, but don't have the same effective ness. It raises your heart level, in turn raising your core temp a little, which can make you burn a few extra calories each day. Most of them have appetite suppressants in them too.