[Al weyman]

The thing looks like a bit of an air brake to me so I was wondering is there any advantage in removing it? I have a large aftermarket alloy rad and have also cut away the numberplate section and it runs well cool.

[CrashTestDummy]

I'm thinking the answer there is no. just make sure the radiator is sealed off to the radiator support.

Our ~85 Firebird came to us with a little spoiler that was attached to the bottom of the radiator support. Summer events with a two-driver car, even on relatively-short autocross courses would cause the car to get pretty hot (220-230 deg-F). I grabbed the entire under-bumper ducting off Firebird in a junk yard, and installed it. The temps immediately calmed down, even in 100+ degree heat we normally have in these parts. I later discovered that I really didn't need the upper ducting (that bolts to the bottom of the bumper cover to the top of the radiator support, and down the sides of the radiator support), but the factory front chin spoiler that spans entire front of the car was very necessary to keep the car cool.

I figured if I still needed the ducting, I'd start bending aluminum, as the factory plastic parts were more than 10# altogether. Turns out I haven't yet. We'll see how things work with the new mill.