You could be forgiven for thinking that the VAG 1.8 liter turbocharged motor was the go-to motor for the company in the late ’90s and early 00s. It appeared nearly everywhere in the U.S.; the Golf, Jetta, GTi, GLi, Passat, Beetle, Audi A4 and Audi TT all received the forced-induction unit. And that was just in the U.S.; go to Europe, and you’d find many more models and even other companies with the venerable motor. You’d also be forgiven for thinking they were all the same – however, a pause for thought would tell you they couldn’t be. First off, there were the drive train configurations; the Golf-based variants have their engines mounted horizontally, while the Audi A4-based cars have them longitudinally. Then there is the output that was available from the factory; the 1.8T started with 150 horsepower and ended with 240 horsepower in the highest output TTs. Immediately, you’d think they had just turned up the boost, but in fact there were a host of changes to the 225 horsepower motors to help sustain the increased pressure. There are, in fact, no less than 13 distinct versions of the 1.8T from that generation. All shared the same basic structure; cast iron block, 20 valve head with a single turbocharger; but details including injection, computers and engine management and breather systems vary in between each of the models. The Audi TT was the only one to offer various engine outputs though; available in either 180 horsepower or 225 horsepower versions, the later of which was pared with a 6-speed manual and Haldex viscous-coupling all-wheel drive. Though heavy, they were nonetheless sprightly thanks to the turbocharged mill. I’ve said for some time now that I think these will eventually be more collectable as they were an important part of the development of the company, yet few remain in good shape. Were I going to get one, I’d opt for one of the 2002 special edition coupes; the ALMS edition, launched to celebrate the American Le Mans Series victory by Audi’s R8 race car. Available in two colors, Misano Red with Silver Nappa leather or Avus Silver Pearl with Brilliant Red Nappa leather, they were mostly an appearance package but also received special 18″ “Celebration†alloys and were limited to 500 examples: