Winni does absolutely nothing to burn fat.. winni is androgenic and will provide a more vascular, hard, lean look, ONLY if you are lean enough to actually see it. If you are over 10% bf, I wouldn't even both.
Test + Diet + cardio will burn the same amount of fat as Test + Diet + Cardio + Winni as winni has no fat burning properties. If anything, stack cytomel with test.