I might be able to help you on this one jfinley6. For moderate use, the 2000 Audi s4 bike rack I recommend is either the
Thule 962XT or 961XT Speedway trunk mount bike racks. They are engineered to fit your vehicle very nicely. Both include the industry's highest stability standards by a long shot. The Thule 962XT can carry 3 bikes and the 961XT can carry 2 bicycles. If you want to carry four bikes then you'll want to go with a 1.25" hitch bike rack because just about all of the leading trunk mount bike rack manufacturers only make bike trunk mount models that fit up to three bikes, not four). The
Thule 914 Roadway hitch mount bike rack for 1.25 inch hitches is the one I'd pick for your 2000 Audi s4. It's a good blend of high-performance at a reasonable price. And you can opt to spend more for the optional accessories for extra bike stability and locking security. Interestingly, the Thule 914 Roadway fits both 1.25" hitches and 2" hitches right out of the box because of a new feature called the Stinger Swinger.