Absolutely bro. That is actually a very good combination since GW is a non stimulant. There is no interaction issues at all. I know Dylan has been a very big supporter of those two stacked. Should be very effective
The thing about gw is that it gives you incresed cardio ability. So to reap its advantage then step up the cardio. I have a bud on the gw,phen, and the eca stack, and e is pulling off about 3 lbs per week. Make the cardio a little harder...such as incline the treadmill more and walk a bit faster.