Ian C:
Navigation - so many people in the UK seem to expect this in a £95000 car (even though a TomTom does everything you need). You may never use it but it will help when you sell the car
I'm sure you're right about Nav increasing the resale value, but I can't imagine that it would increase by the amount it will add to the cost of purchase. Many GT3 buyers don't care about things like Nav (but I'm sure some do).
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73 Carrera RS 2.7 Carbon Fiber replica (1,890 lbs). Former: 73 911S, Two 951S's, 996 C2, 993 C2, 98 Ferrari 550 Maranello