Car tuning (Need for Speed: Underground 2)

People!
Do not tell me exactly how each change in the settings of the machine affects (preferably the pros and cons), otherwise the tips are so muddy that you will understand hell. Plus where to see what kind of car you have - front / rear / all-wheel drive. Plus If you take a sponsor, then it says that then you can take a wheelbarrow for free. I already have 3 sponsors - and not a single ball machine ...