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Many posts in this thread assume that the only hardware difference between the high output N52 and the low output N52 is the 3-stage intake manifold, which I don't think is a foregone conclusion.
In other words, just because the N51 has the 3-stage intake manifold, doesn't necessarily mean that it's just a (very elusive, btw) tune away from being a high output N52. I've heard some talk that injectors may be different, as well as the exhaust manifold.
Not trying to rain on anyone's parade, just saying that there could (and likely is, IMO) more going on here, hardware wise, than simply the addition or deletion of an intake manifold. I would love to be wrong on this, because if it's that easy I would be all about it.
Of course, the tricky part is the tune. For some reason no one (in the US, at least) can seem to really crack this thing.
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