Thanks for the data. I have the N52. Got the CATs in. They're not OEM but thought I'd roll the dice and see how it turns out. Got a problem though in that the two CAT to exhaust flanges are jambed up right next to each other, no space between them, which is not a problem in and of itself, except that the twin exhaust pipes on the vehicle between there and the muffler have maybe 3/4" between them so I can't fit them onto the new CAT flanges to bolt up. Guess I'll have to find a way to squeeze them together, and I'll also probably wind up piling extra flange gaskets on b/c when I squeeze them together, there is a larger gap between one pair of the mating surfaces than there is between the other pair. Darn it.

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2009 X5 3.0
2001 X5 4.4 - Sold