Good or bad cooling in decent case

[rx7i2]

I've got a decent case on my old rig and right now, there's two normal case fans, one in the front and back. These are the only slots I have on this case and i was wondering if I get one of those exaust fans you install onto where a pci slot should be, will it suck up all my intake air if I have a powerful one running in the front, and the same decent one and the exaust in the back.

 

[Maxx]

it may drop your case temps a bit but also might decrease the amount of airflow going out the exhaust fan because its taking the air.

 

[neweyedeya18]

add a nice blowhole to the top or a side vent across from the cpu w/ a fan

i have 5 fans and a bay freezer to keep my dvd rom cool

2 intake in front w/ my 2 hd's
1 in back
1 intake across from cpu
1 exhaust on top
bayfreezer right under my dvd rom

a little excess but they are all really quiet fans

i wouldnt waste time on one of those pci slot fans, thats my opinion anyway unless its only purpose is for a little better airflow to video card