to be honest i would never use that shop again,
you have 2 choices as i see,
1: add a fan on the rear as intake should supply cool air to the evo and exhaust out the top
2: make all front and side fans intake then rear and top exhaust (make sure you add a rear fan) and make the evo blow out towards the exhaust,
option 2 will be optimal air flow and cooling ignore anyone who talks about positive and negative pressure it won't matter until you actually know what your doing with air flow, from the pictures i think whoever works at that shop does not know what there doing but adding just 1 fan blowing air to the evo should reduce temperatures significantly
I think I'm going to go with option 2. SR-71's diagram points to the same answer as well, thanks !
I really don't know what I'm doing though, how hard is it to take out the fan and put it back on the other side ? Am i gonna have to unscrew the whole thing or can I do it without having to do that (since the radiator wouldn't move) ?