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There are two separate discussions going on here:
1. A discussion of how much power the S55 is likely to be able to make with tune and exhaust mods
2. A discussion of how much power the S55 is likely to be able to make with all sorts of modifications including new turbos, etc.
Also, there are plenty of engines that can handle 700-900whp, sure. But they aren't daily driven for 50k miles without serious repair AND/OR they aren't turbo engines that aren't seriously laggy.
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