You learn something new every day...
Thanks chaps for the input.
I've learnt that there are indeed 'Security Torx' bits available, although my problem is now sorted. Ironically, I was just watching a YouTube video for a dirty MAF on a Mk1 Focus C-Max and the car in question had the very same security bolts on the housing.
I'm hoping that my quick fix on the Audi stays permanent, and I'm going to attempt the same cleaing operation on my friend's car - similar MAF issues.
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2010 B8 S5 Sportback quattro 3.0 Supercharged in Sprint Blue (current girlfriend)
2000 D2 A8L quattro 4.2 in Audi silver (my ex-girlfriend)
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