An ECA stack is a very popular choice and adding in Aspirin wouldnt be a bad idea at all heres a part of an article on "ECA" at wikipedia which explains what these 3 supplements do, and why Aspirin is a good idea to add
Quote:
The effects of the ECA stack in weight loss are primarily due to the ephedrine component. Ephedrine acts both as a beta agonist and stimulates the release of noradrenaline. Increased circulating noradrenaline in the body then acts on white adipose tissue by increasing cAMP levels. This causes a thermogenic effect, raising body temperature by about 2 degrees and increasing the user's metabolism by 10% in conjunction with the rest of the stack.
However, the body's negative feedback system then activates to normalize the metabolism. This is done via the production of phosphodiesterase inside the cells, and prostaglandins outside the cell, which both lower cAMP levels within the cell.
Caffeine inhibits the production of phosphodiesterase inside the cell and therefore slows the cAMP breakdown. It also, by binding with and competitively inhibiting adenosine receptors in the brain, triggers the release of adrenaline which increases cAMP levels further.
Aspirin inhibits prostaglandin production outside of the cells, which, in conjunction with caffeine, greatly prolongs the thermogenic effects and increased metabolism by substaining elevated cAMP levels.
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More details on this type of stack can be found
http://en.wikipedia.org/wiki/ECA_stack which covers dosages, etc.