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If you are into tracking that much on a RWD platform, I doubt bumping the S55 up significantly in power is going to be the first factor on your list. This is a longer wheelbase vehicle with a still-substantial weight already near the limits of adhesion and with a massive, flat torque delivery.
Let's actually evaluate what we know of the S55:
1. It has serious primary and secondary cooling systems in place (look at the diagrams and radiators we know exist, good Lord that's a lot of cooling)
2. It's a closed deck block. The n54 was an open deck block. A closed deck block will be significantly more capable of taking much higher levels of boost/pressure/heat.
3. The n54 is capable of supporting very high HP figures. The S55 appears, by what we know so far, of being a N54-based engine that is significantly more built for safe power from day one.
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If you want to look at n54 tuning compared to the S55, evaluate only what you know so far. It appears to make an excellent platform for 500+ whp goals, on paper.
Also, the N54 is not suitable to run heavily tuned on the track without significant cooling capacity. The n54, even with stock oil coolers, couldn't handle it's heat when driven hard. It appears that's been taken care of in the s55, or at least was a major goal.
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