simple,
no targa, torsional flex from the chassis. Anyone that has a Targa supra has experience the wet noodle effect while driving. It sucks. Now it can be 100% CF but any BENFITS of weight gain go right out the window with all the bracing that the targa needs to have to work properly and not display the wetnoodle supra. The stock Targa is NOT that heavy.
no but there is a considerable amount of body flex. It makes for a, umm "intresting" ride especially on uneven surface.
tbcmorris is spot on. The targa is infact part of the structural integrity of the Supra. Now he is not correct about it not being made of 100% CF as it can, just that it will weigh as much as the stock targa and off course, lighten your wallet.