When the fan is right up against the radiator I doubt you really need a shroud though. The shroud is there to help optimize the fans CFM as well as be a cone for pulling air thought the radiator. If the fan it right up against the radiator the fan can only pull air from the area in front of the fan. All other space is free flowing otherwise, you just end up blocking all air flow. But really since he doesn't have overheating issues, I'd sat his fans are working well enough in their gimp state. Now if he fixes the electric so it's turning the direction it was designed to go and make it a puller, it will work at say 100% instead of 75-80% in it's current state. Fans are designed to move in one direction revering them without turning the blades around cuts down on their efficiency.
I agree that if he's not overheating, he may not need it... But the shroud makes sure that the air pulled in by the fan passes through ALL of the radiator instead of just the circle area of the fan. This means that the radiator is not being as efficient as it could be, which is why I mentioned it on my earlier post. Keep in mind that when you are driving at higher (highway) speeds, the air is free flowing anyway, so having a shroud should not affect the performance. But a low speeds (like when hitting the trails in 4L), you need all the air you can pull, and he will be installing a winch (which he did not have before) which will block part of the air coming in to the radiator...
