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In Europe there are loads of tunes for the 530d (as it's called over here). The 535d in Europe has the twin turbo six. Twin turbo as in two separate turbos BTW.
But most of the tunes from the brand companies like Hartge, AC Schnitzer etc are piggybacks.
And as regards the M550d. Even though it runs the M5 close on paper, it doesn't feel anything near as special or fast as the M5. And it suffers quite a bit from turbo lag. Not that impressed. But sounds great inside due to active sound that in the M550d relays the REAL engine sound.
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