Cost would be the big reason automakers don't install more streamlined belly pans at the factory. Also, dealer service department staff would probably complain to the automakers if they had to remove such pans for routine work.
However, I could also see a risk with an aftermarket installation if the air entering the engine compartment through the grille and radiator cannot flow out efficiently. The air under the hood could stagnate, so the modifications could lead to overheating. Watch your coolant temperature gauge in the summer to stay safe.
However, I could also see a risk with an aftermarket installation if the air entering the engine compartment through the grille and radiator cannot flow out efficiently. The air under the hood could stagnate, so the modifications could lead to overheating. Watch your coolant temperature gauge in the summer to stay safe.