I have driven a 992.2 GT3 but not hard on the track. I have been a passenger in GT3s with talented instructors and they are an amazing car. That said a well set up M3 is surprising competitive at the track. At my last PCA event I ended up passing a lot of GT3s in the A group. The cars that I couldn't keep up with were a couple of well set up 996 turbos.
AW on Fox Red Extended, Alum trim, ZPP, ZTP, DCT, 19" wheels, Heated front seats, HD radio, Sat radio, I-pod & usb, Premium sound, AP racing BBK, 18 Volk Racing TE 37s, Akrapovic Evolution exhaust, AST suspension