I actually just discussed this with a VW/Audi representative. My parents would be very interested in the new Toureg 5.0L V8 Diesel but they only offer the bitchy V6 diesel here. And we also inquired about getting a german spec S4 Avant here, and even though it is a body that has been crash tested here and an engine that is already here in the country in the sedan, it would still cost around $15-20k in various fees and conversions on the vehicle (mostly programming **** lol) the representative told us.
Im with u though, having the V10TT RS6 here would be BAD ASS. But unless ur made of ALOT of money, ur better off just getting something that is here legally sadly