ACRJoe is correct ... in competitive racing, with winning and losing measured in hundredths of seconds per lap ... 34 pounds of un-sprung weight is huge. I will venture to opine that most of the 4,036 FGT's will never see a track, let alone be competitively raced without lots of other modification, including even lighter road wheels of dimensions different than OEM forged FGT's.
As has been documented numerous times on this board, cosmetic appearance and mechanical mods are simply owner's preference and perrogative. In my case, I've chosen to opt for what I believe are wheels that are closer to period looks, while retaining OEM appearance and likely no discernable difference in performance on public roads.
I'll just have to try to cut back on the linguini and red wine to recapture my weight penalty on the interstates and twisty's of the Northeast. That of course is easier said than done ... HA!