Does the sport model have extra plastic clips as indicated in the pic as compared to non-sport on the radiator cover.
I'm trying to remove this cover to install a stillen gen 3 and took out all the clips and screws as indicated by the red circle but doesn't want to come out. There are still three clips holding as marked with white squares but none of the DIYs or service manual advise to remove these.

pic, courtesy of stillBalling37

 

That is correct, you only need to remove the red circles. It doesn't come out easily because I think you need to push the cover towards the back of the car a little bit then up to make it come out.
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will try as you've suggested, but it still feels like something is holding it down.

 

^yeah, it is a small clip in the back that ucla bruin says.

 

Yeah if you look on the back of it (the part that runs vertically) there are two holes with plastic pieces running into them, you need to push the cover from the front to the back and make it slide back to undo those

 

I did get it out but I had to take out the three plastic clips as marked in white in the pic.