I built a slip-on over fascia for the '84 CRX. It extended the length 6-inches, enlarged the side radius, lowered the forward stagnation point, reduced the cooling inlet, and faired in all the concavities.
It did helped top speed a little. The tail extension however, was good for most of the speed increase.
https://ecomodder.com/forum/member-a...speed-aero.jpg