25mg Ephedrine HCL via Bronkaid
200mg Caffeine
85mg Baby Aspirin or 9mg of Yohimbine (the necessity of aspirin is debatable and some people opt for an ECY stack instead of the traditional ECA)
4 weeks is a good time. ECA or ECY is really hard on the adrenals and keeping it at 4 weeks is ideal. However, it goes without saying that your diet is 90% of the battle, then cardio & weight lifting if losing weight is your goal.
I wouldn't quite call the other fat burners "a scam", but they do vary in efficacy. I'd recommend some non-stim fat burners to stack with your ECA, such as Alpha T2 & DCP (or simply rasberry ketones if not DCP), Androlean is also a powerful non-stim fat burner if you have a deep pocket.
Something to keep in mind, cortisol and tesoterone have an inverse relationship and stims raise cortisol, it's not necessary, but optimal (in order to maintain as much LBM as possible) to have an anti-cortisol and/or some form of a natty test booster to counter act the progressively elevating cortisol levels elicited by this particularly harsh stim. You'll still lose fat fine without them, but you'll preserve more muscle with an anti-cort and/or natty test booster and it's optimal to keep your test levels as high as possible because test has fat burning effects as well.