Best choice

Hi friends, first i would like to apologize my english.
I do have a closed case with 2 exaust 80 (very low profile crappy) fans and 2 delta 120x38 front in a push pull radiator, so it is warm air, so the temp inside the case is high.
I am planning to pull out some air inside.
options :
1 - put a 80 exaust fan top.
2- Change the 2 back fans for 2 80x32 good fans(sunon)
remembering a has a antec 120 fan in the botton of the psu.
thanks the attention.

I would take option 2, change the two back fans.

Actually, I think I would go with option 1 AND option 2.

120 x 38mm fans should be pushing a pretty good amount of air into your case. A pair of 80mm fans is not likely to get more than half or two thirds of it out but a third 80mm as a blow hole on the top should be about right...I think!

Dealing with airflow can be tricky and often does require case mods.