Motorsport magazine have just posted this video. Turn the volume up... There is an article in this months magazine too.
I always thought It would be awesome to take a higher mile rough 550 and turn it into a road going GT1.
John Tirrell (Independent Ferrari Service - Team Pilota) did just that... Image Unavailable, Please Login Image Unavailable, Please Login Image Unavailable, Please Login Image Unavailable, Please Login Here he is passing me going into The Bus Stop at Watkins Glen International... 18:15 The view from inside... Watkins Glen International - John Tirrell driving
With the exception of the car not having a sequential shifter, John Tirrell's 550 GT sounds a lot like Colin McRae's Prodrive 550 at Le Mans...
I have some vague memories of some cars transformed that way - maybe by Prodrive; there was an article in an old issue of evo magazine (I should look for it, it's somewhere at my home).
In the mean time, I found this https://www.ferrarichat.com/forum/threads/550-lm-from-evo.33948/ here.