Maybe need cats, but if so get ready to shell out the big bucks!! I replaced mine and it cost $2200 bc there is no aftermarket solution for the 3.0i in the X5 - cats are basically part of the manifold, so all of it has to be replaced with OE parts.

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2001 X5 3.0i (PP/WP/AP) Traded at 213K miles
RARE White on Black - Why does everyone get Tan??
First E53 with 215s on XOutpost!!