I'm interested in buying an Audi A4 as my first car. I testdrove a 2001 2.8L Quattro yesterday, and I really liked it. The owner said it has 8 airbags, 4 rear and 4 front. My concern is the curtain side airbags. Do they replace a regular side airbag that one would normally find located near the door handle, or are they something different? Thanks