This is an add on front bumper dive planes for the 991 GT3 Cup

These lightweight aerodynamic dive planes on the flanks of the front bumper provide additional downforce at speed.    They are made from Nylon Plastic and are flexible to fit up to the bumper, but still rigid where you need it. 

A great add on piece for your car.

These are made for the GT America front bumper, but we have found that they fit closely enough for standard GT3 Cup too. 

Installing Joe Toth Dive Planes – 987.1 Porsche Cayman S – YouTube