it's good to have goals and all...but you're not going to get anything even close to what you'll see in the BMW brochures with a starter DSLR, kit lenses, and a minimal understanding of processing. a whole lot (and i mean a whole, whole lot) of automotive photography these days is either fully/partially rendered or wholly dependent upon photoshop.
that said, don't worry about the equipment. it won't do you any good unless you know how to use it. focus on your skills and all the technical aspects of pulling off good shots, then worry about what equipment you need. you shouldn't have to grow into equipment, you should grow out of it.