For those of you who have an Audi you may already know they are maintenance intensive as they age. Everything from sunroofs to seals needs attention. Audi makes a great product but they are limited by mass production prices. Plastic and rubber products are used extensively where other materials might be a better choice, and the plastic becomes brittle after a few years. Among the many things that needed to be serviced on the car or upgraded to handle the power, the heater core was the worst to replace short of pulling a motor. The part is nested deep under the dash by the firewall. The plastic had become brittle after 12 years of coolant running through it. It did its job but had to be replaced.
The picture speaks for itself....there are literally hundreds of parts behind the dash. This is just the maintenance, we haven't even got to the modifications yet... Just letting you know what your getting into if you want to start a project like this. Just routine maintenance...