The MKII TT 2.0T is an ideal candidate for introducing increased levels of boost, and the merits of an OEM upgrade are obvious. You can retain the faith you have in the engineering of your Audi and realize significant power gains by installing a genuine VW/Audi high-capacity K04 turbocharger.
Additionally, with an integrated manifold, graduating to the KO4 is well within reach for any confident DIY'er.
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Audi MKII TT 2.0T (2009+)
Let me know if you have any questions.