Open grill vs inserts

Looking to make a grill for my 2012 Coronado glider need pros and cons of using a more open design 75% flow throu space expanded metal vs punched sheet of stainless 40% flow throu will more flow help cooling or just cause more drag due to too much air getting in engine bay I have heard more closed grill inserts help with air flow around the truck is it true thanks in advance for any reply any one who has used a more closed design on a kw or pete seen any spike in temps on a hot day pulling a heavy load I see a lot of those king grills they look nice but I don't want to sacrifice ability to cool rig down on heavy pulls I run 77 and 64 a lot in summer

 

Yes they would but u have to be able to close them for winter

 

No egr it's a glider forgot to put that in original

 

I believe you are probably right I think I will use a hex expanded metal to make the main structure witch has a 76% open area and back it or cover it with a stainless steel screen to keep the crap out of my condenser cac and radiator that should give me a good amount of air flow the grill I have now has a synthetic screen and crap horizontal bars and it is held in by 3 bolts two of which mount to fiber glass tabs that r broken I hit a bird and Broke them and it put a hole in my condenser thankfully jb weld wet fixed the condenser but I constantly fight to keep the grill from falling back against my condenser and cac and putting another hole in them crap design it should have been mounted to to front of the hood like the old school classic xl or fld also will eventually build better fenders for it they r a bad design also I hate sunk in lights and the module t style hump fenders