Installing gt3 mk1 bumper
 

I recently bought one of these bumpers and am preparing to paint and install it. I wanted to know if the plastic air dams that route air to the radiators remain on the car. I don't see them when I see pictures of cars with this bumper.

Did the bumper fit with the original air ducts? Was the middle part already cut out for the 3rd radiator on the GT3 bumper?

In short, Yes. Just put it on. I did mine last year with a stock gt3 bumper and it all lined up perfectly. The ducts fit perfect.