Not easy IMO.. and practically, dont go over 2-2.5K. You will have a better daily driver at this range then trying to stuff it up with a hard suspension for the little tiny bit of output gained.
cooling on this motor isnt as great as the new sundown subs but you can put the pole plug to help as well...also i think dave at psi can put spacers on this to also help on cooling
With a pole plug the v.1 can hang with many of the bigger 3" woofers out there -- the v.2 motor has significantly improved coil cooling, though, but that motor is harder to find as I've sold fewer of them so far.