K03 vs K04 Turbo for the Audi & Volkswagen 1.8T
https://gradeautopart.com/blog/2021/07/06/k03-vs-k04-turbo-for-the-audi-volkswagen-1-8t/
WEBJul 6, 2021 · No matter what vehicle your 1.8T came in, they all used a BorgWarner K03 turbo, from their unfortunately named KKK Turbo series. One of the most popular modifications to the 1.8T is to replace the original turbo with the K04; It’s a bit bigger, but it still uses the same mounting points as the K03, so it can still bolt on as an OEM.
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