There are certain cars in this world that will send shivers down your spine, heighten your senses, and make the world around you better. It's like a driver's high, if you will. BMW believes its cars are your best source for this feeling. The German company's newest commercial promotes that this feeling remains within you long after you step foot out of your car, whether it's a Z4, an M6, or an X6. What car gives you this feeling?