it woulda been nice to put a real topic title on here
mojo's are nice...i've seen a 12" hit 147 db's in a somewhat temporary setup. ANY brand of sub will sound bad if not in the right enclosure. going ported will also be louder for you.
just race him. if you win, yay for you. if he wins, yay for him. get back to work, redo some things, and come back at him if you want.
x2 on the cars also. like trunk cars vs hatchbacks