It elevates metabolic rate slightly and it blunts appetite.
The metabolic increase is just a few percent though, 98%+ of the fat loss on EC stack will come from hunger being blunted. EC might increase metabolic rate by 100-200 calories.
DNP on the other hand (depending on the dosages) can double or even triple your metabolic rate from a 2500 metabolic rate per day to 5000+