im new here, and am looking to buy an M3. There's the one i want for sale but doesnt have navi. i've been looking for about 2 months now and have noticed that M3's for sale with navi (6 spd coupe) are few and far between. I've heard that installing navi after the fact is expensive.
Can someone give me an idea? Has anybody installed bmw navigation system or an aftermarket one?