Liquid Clenbutrx is an EYC stack, with the addition of a few other ingredients. It is liquid, so easily absorbed. You will get a jolt quicker then a tradition EC/A/Y (whatever) stack. Personally, I find no use in aspirin and would substitute it for yohimbine HCL any day of the week. If you can find liquid Clenbutrx for a rasonable price, it's nice to try, but if you want the best bang for your buck, make your own EYC stack at dosages of:
25mg Ephedrine HCL
200mg Caffeine
5mg Yohimbine HCL