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I have never tuned a car before but I came across this thread and find it very interesting (thanks!).
However, based on what you guys said, a tuned x28i (N20) can have similar power as x35i (N55) - so... I am wondering why not just buy a x35i at the first place? It's just $3000 more, and I believe Dinan + Installing Cost wouldn't be cheap neither right?
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