actualy the radiator is on the transy side of the motor so ther eis no exhaust behind it.. And im not to far of of the air flow needed to pull this off, Im thinking raising the rear of the hood 1/2 max to create a draft through the engine bay will solve the issue.
Also if you look at the side profile there is a small air spoiler that hangs below the rest of the nose piece this will be extended a inch or so and that will drive more air into the radiator..
However I whant to avoid putting holes in the front of my nose as much as possible as its doing a great job getting air around the car.. I went out last night to get a idea of frontal area... by using bug splats and there was about the area of the license plate that was bug splatted , the rest was free of bugs, that means its separating the air quite well.
I have no true understanding of aerodynamics besides what my eye think looks good.. and real world tests like bug splatters
and any added aerodynamics over the stock boxy front end is a improvement.