I'd replace both if they haven't already been replaced.

The exhaust CPS is extremely easy to do, maybe 5 min job?

Exhaust PN#12147518628
About $100 for genuine bmw part or hella makes one for about $60

I guess start there since it's easy and cheaper.

Intake side will take a little longer, here is DIY: https://xoutpost.com/articles/x5/eng...-x5-3-0-a.html

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2004 BMW M3 Individual
2009 BMW E70 X5 35d
2011 BMW E70 X5 35d - Totaled
2009 BMW M3 E90 - SOLD
2006 E53 X5 4.8iS - SOLD
2002 E46 M3 Convertible - SOLD
2006 E46 M3 ZCP - SOLD
2011 E70 X5 35d - SOLD
2000 E39 ///M5 - SOLD
2003 E53 X5 4.6iS - SOLD
2006 E83 X3 3.0i MSport - SOLD
2000 E46 323Ci - SOLD