Luke, you don’t want an Audi in Lemons. Unless you just want heartbreak. Pricey, pricey, heartbreak. I think the only reason that Blue Goose continues running their 4000 is because one of their guys is a full time VAG mechanic and can keep it running.
Personally, I think the sweet spot for Lemons cars right now is probably the SN95 Mustang (1994-2004). Tons of them manufactured so easy to find at budget-friendly prices, huge and widely available parts base, and they’ve been around long enough that all the tricks have been figured out and should be pretty widely known.
BMW e46’s are in a similar position, but being German, the parts are more expensive. And being a BMW, the first thing you’d really want to do is to go ahead and change out every stupid chassis bushing, which is tedious and not cheap. But they all will fail under race conditions. Ask me how I know…