Jack PadsHere's a little enhancement that I've been meaning to do for a while. These inexpensive rubber pieces provide a good place to raise the car using a hydraulic floor jack, or a 4-point lift (like when having tires installed, for example).
Each pad is composed of two pieces. You position them together, then use a jack to press them into the correct points on the underside of the car. They lock together and lock into place on the car.
Back in 2005 "SwiftA4" posted instructions for doing this on the A3 Forum. The instructions and pictures are excellent, so I'm just going to link to them here. Part numbers are included. (If for some reason that thread on the forum becomes unavailable, I have a copy saved that I can post here.)
In addition to the 4 pad assemblies, I also got a special metal disk from ECS Tuning that fits into the pad when using a hydraulic floor jack. This gives a very stable lifting point. The disk has a bump on the top that fits into the bottom of the jack pad to keep it from sliding.