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Back when my 5ktq was a 10v on CIS we took the filter cover for the airbox, cut it completely open so it was a big open square, and then heat shielded the crap outa the exhaust manifold. Not sure what it did for power, but you could hear the intake noise a heck of a lot more as well as the diverter valve.
 

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Here's what I did with mine, sounds pretty similar to Phils:



Volvo also has a CIS cone filter piece that one may be able to fit to the Audi box:
 
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