The N55 is more than fine internally where he is right now.
600whp/600wtq @ 24.5psi is a confirmed rod exiting the block point on a stock N55. One in the shop where I work right now....
We are building a forged bottom end for that N55 in the coming months, a N54 we built with similar topology just put down 847WHP/726WTQ.
I don't see the axles being a problem unless you wheel hop them, the trans? time will tell.
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