I doubt that it would be active as a stimulant, at least not in the classical (S)-amphetaminergic-type way, due to the 2,5-dimethoxy moieties. It might be similar to trifluoromethylpiperazine, but the heterogeneity of the mechanism of action of various piperazines (broad-spectrum 5-HT releasers, 5-HT1a ligands, histamine H1 antagonists, dopamine D2 antagonists, etc) doesn't really allow a great prediction a priori.