I think the nsx 2004 shell and the HSV-010 shell are still the best touring/ realistic shell tamiya had ever made. The R8 is quite unstable, in fact rather difficult to drive with. I would suppose that an option rear wing will help but it wont be great enough to completely change the way it drives. I cant comment on the 458 simply because i havent tried it yet, but again an option rear wing is more than neccesary for it to perform well. Hope this helps.