Audi 1T TDI engine
 

Here's a cool thread about a guy swapping into his Audi a 1990 1T TDI engine, which is an inline 5 TDI engine more similar to the D24T than the 1.9 TDI.

https://lh3.googleusercontent.com/-N...0/100_9948.JPG
http://www.motorgeek.com/viewtopic.php?f=6&t=41465

I've never heard of these motors before as they didn't sell them in the USA, but it looks like it would nearly be a bolt in swap for a D24T if they were obtainable. That would be pretty sweet, as I much prefer the higher torque/lower rpm powerband of the TDI motors over the IDI engines.

I find the photos of this engine very interesting, because it almost looks like a "hybrid" between the newer 1.9 TDI and the D24T.

Volvo 850 TDI form
http://www.motorstown.com/images/volvo-850-tdi-01.jpg

Hot dog, that would be a very cool ride. Audi Quattro with a diesel! I often thought about a Audi 4000 CS (80?) with the D20T in place of the inline 5 gasser. But this is another thing all together, 5-cylinder TDi powering all 4 wheels, so awesome.