It's very much about personal preference- I love ephedrine as a pre workout stimulant that makes me day a little more fun, in terms of adding it to MDMA I find it makes negligible different. ECA (Ephedrine, Caffeine, Aspirin) is a common diet pill and work out supplement because they enhance each other. If you want a more stimulated roll, and these are your options, feel free to ad them. Some people prefer the floored feeling of pure MDMA, and would never want to tamper with pure MDMA- if you are certain your molly is MDMA through reagent testing, I'd go with what you feel suits you best, it's a very personal decision.