Why do most stack these two? Many stack Hype Reloaded with Dust v2. These are typically those looking for some energy from 1 scoop of Dust v2 and want to ensure huge pumps along with performance from a scoop of Hype Reloaded. By taking 1 scoop of each product, it's like getting 2 scoops of "pump & performance" with 1 scoop of energy. If you are stacking, PJ says combine them both in 16oz. Water and drink 30 minutes prior to your workout. Dry scooping Hype you will not acquire the full effect.
Do you need to stack them? Not at all. Both products are formulated to be fully effective by themselves. Try them both for yourself and take your workouts to the NEXT LEVEL!