No, then you'd be stuffing more air into the box which is already getting too much air. Using the 120 as an exhaust would be better actually but the best cure would to be to balance the airflow by opening up the rear fan hole and putting a very low CFM 120 in the front.
Phenom II 940 Black Edition quad core @ 3.5Ghz
4x2 Gigs Patriot PC2 6400
Cooler Master HAF XB EVO,
Some other stuff,
Even more stuff,
If the automobile had followed the same development cycle as the computer, a Rolls-Royce would today cost $100, get a million miles per gallon, and explode once a year, killing everyone inside. --Robert X. Cringely, InfoWorld magazine