If this is true then trust the FIA to declare the McLaren exhaust illegal, but Brawns double diffuser was fine back in 09 as was Red Bulls flexi wing in 10. I hoping this isnt true though because what a wate of testing for McLaren if this is the case and if the whole car was designed around this radical exhaust then oh dear
Theres a good photo of the McLaren exhaust on Scarbs twitter feed. Not much to see but we'll wait and see what comes of the FIA taking a look.