Thanks. it's a pretty big box and I don't see how to remove it, but if you happen to know what it's called I can try to look into it. A hole occurred to me but seems like a last resort.

I looked on realoem and couldn't identify t (maybe part of cooling brakes and transmission?).

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2001 X5 3.0i Old Gold -built and bought 08/2000, now at 220K miles
2005 X5 3.0i Silver Bullet -built 05/2005, bought 03/2021 at 95K miles