GT3 RS...Boxster Spyder......430 Scuderia.....Need I go on...Any track focused car....Never understood anyone adding the options the company took out to make the car more focused on the road and track.....You may as well not bother and get the standard car......The only option needed in the coupes is air con I would say...The rest leave alone.....As I say it you myst have Say Nav then buy a Tom Tom or something...Probably would be cheaper than the factory option any way.......Plus why would you need it in these cars anyway as most owners have them as 2nd cars that they use at the weekend....
what does a Sat Nav system weigh anyway? and it is not like you are going to be 0.000451 quicker in each corner on the track without the nav. You can't have nave in a Scud anyway i dont think.