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Originally Posted by m5james
$500 for just the headers, $2000 for the whole setup. I'm sure custom headers alone would be far more than buying a used M5 setup and just adapting the water feed lines. Turbo moding companies have said that after their upgrades, there's no differences between the two turbos, but in the bigger picture, upgrading the headers, even with minimal gains, would probably still help.
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If you can get it for 2k it'd be worth it but otherwise upgrading the turbo would be the most cost effective. Though the limiting factor will be fuel as usual on the direct injected engines.
With Meth and upgraded turbos I wonder if the S63 could out perform the S63tu due the the lower factory compression allowing higher boost?
Though there's almost no interest in pushing past tune and dp's on this platform. I only know of one with the Pure turbos on it and they are having unrelated issues last I heard.