You can tell by my upgrades I have POWER MAX 3, HX40, DD III’s, was wondering about putting on a box to help with the timing. What would be the best way to go and do I need to spend the money on one??? Should I stack a comp box on it? Just looking for a little more power and being able to adjust my timing like the comp box. Should I just sell the power max and go with just the comp drag box??? Why do people put stacked box's on??