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Was unaware that the N55 was ~360HP limited? Depends how much $$ you invest in it. With a simple flash only that's probably accurate an number. There are 400hp N55's I've seen posting dyno charts on this forum.
From what I know....
The Dinan Stage 3 is good for 370HP + 400ft/lbs. I also know they're working on a larger compressor for the twin scroll turbo which according to them is good for 400HP.
RB is almost finished with a turbo upgrade for the N55 similar to what they have made in the past for the N54.
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