i got a 2001 audi tt 225 and i am looking to do turbo upgrade. What all will i have to change if APR Stage III

Q: like any extra parts like exhaust or anything?????

A: Upgrade to your fuel system, a professional tune on a dyno and larger exhaust. The latter isn't absolutly necessary, but it will be helpful. Along with a larger intercooler and possibly an aftermarket MAF

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