Went down a deep Google hole last week after finding "Pikey R600" and then MQB Air intake mod:
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So bought one of these blanking plates, which, well, blanks off the hole on the driver's side of the air intake which just goes straight through to the engine:
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It was a perfect fit and ripped into place solidly; I've not fitted the screws yet, as it's holding in place tightly.
The theory being that it forces air straight into the airbox, rather than letting it flow over the engine. Haven't had a chance to really try it yet, but will report back if it makes any difference.