I prob. wouldnt stack a stimulant Fat Burner with a stim pre workout. You could take a pre workout then 6-8 hours later take a stim fat burner but you wouldnt be getting the full effects becuase your only taking it once per day.
I would recommend a good non-stim fat burner like Lean Xtreme taken 2-3 times per day. It will help to lean you out and has a good recomping effect. Stack your LX with Powermax, Powermax is a very clean pre workout, no jitters just focused energy. Also the pumps with Powermax are amazing, most commenting its strong as hemavol but you also get the added stim effect.
If you interested in Powermax let me know and i will send you 2 free sample packs(4 scoops)