6'2" @ 170lbs and you don't have a six pack? I'd not worry about the
fat burners and do a wider variety of ab workouts. crunches, leg lifts, "rocky" sit ups, put your legs on a chair or bench so your femurs are at a 90 degree angle with the floor and have your back on the floor and do some crunches and sit ups from there. Do abs like every other day if you want to improve them quickly (some people will say to train them less... i prefer to do them more). lying on a decline bench and do sit ups with a plate on your chest.
I wouldn't think you need to worry about burning fat at your
size and weight.
you are toooo young to be taking stimulants or
steroidal compounds at your age, but if you are HELL bent on it and going to take something anyways i'd drink 2 cups of coffee before doing abs and take 6 oxo. NOTHING
steroidal, but a safe, mild anti E wouldn't be tooooo bad of an idea. NOTHING stronger than 6 oxo, i wouldn't even say ATD.
No-xplode is a good pre workout drink