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As desertman123 said.....it seems to look like more and more it's an N51 issue which of course we don't have enough data points in here yet to 100% make that assumption.
But it would make sense since it is controlled to "tighter" emissions that it would be more sensitive to a change such as cat-less headers.
I haven't really looked at the emission differences between the N51 and N52, only know so far that the N51 came stock with a 3SI and lower compression from the factory.
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