Wonder what his baseline was?
A boss stock dyno's at around 400rwhp so this seems about right. My buddy has a 2013 boss with intake and off road x pipe and he Dynoed in the 420's also. It all depends on the dyno and if whether they are STD numbers or SAE. STD numbers are gonna be a little higher and people normally go by SAE seems to be more accurate but these number seem pretty normal or average. AED is definitely doing great work with these cars It took me about a year to jump on board but don't look back at all.