We will not get into discussions here on the use/abuse of ephedrine hydrochloride and turning it into amphetamine/methamphetamine. Ephedrine hydrochloride is nearly a controlled substance, and any puchase of large quantities of OTC drugs containing the substance will be heavily monitored. I can tell you that it is used in the illegal synthesis of amphetamines and methamphetamines, but I will not tell you how. That should be all the information you need as I will now be locking this thread.
Once again, we do not allow the discussion of the synthesis of controlled substances, nor do we tell people where to get the equipment to do it. All I'll say is 'search the internet, but not here'.