Using two different fans will bottleneck your intake/exhaust meaning the fan with a higher cfm won't be exhausting air at maximum capacity. The larger fan can't exhaust air that hasn't entered the compartment yet and vice versa, a larger intake fan couldn't force more air into the compartment than the exhaust can remove.

Dunno if I read that wrong or not considering I'm baked at the moment but figured I'd point it out in case. :rastasmoke: