I know the hood is aluminum, but the fenders are not magnetic either, assuming aluminum?

 

I'm thinking the front fenders are aluminum too, but it's not clear from this diagram below. The doors are aluminum as well (as I found out when my magnetic autocross numbers no longer stuck to the car), and so are a lot of other pieces.

 

I believe Aluminum.

http://www.autozine.org/Archive/Pors...1_Carrera.html

 

Run a magnet over your car, that will tell you. FYI, the only steel panels on a 991 are the rear quarter panels, everything else is aluminum or ABS plastic on the exterior.

 

The only steel is the rear quarter panels. This is the only place my magnetic race numbers will adhere.