Slammed Audi A8
As for tuning, this limousine is performed by ordinary recipe - wheels and fitment. As for wheels, they are really huge with very thick tires. When I see on this slammed Audi A8 I just begin to feel some pain in my back. But after it i remember, that it's an expensive German limousine with air suspension from factory. But I guess that even air bags can't make a ride really comfortable on such wheels. I mean on not ideal roads off course. By the way, suspension was modified because this limo is almost on asphalt. Stock air suspension can't to do so.
If you are seeking some comfortable but not new car as your daily driver, such A8 is not so bad idea. Wheels and better fitment and you will get all you need. Tuning Audi S8 can give you much more emotions, but even TDI is fast enough. But else diesel can be more reliable.