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I'm just guessing until someone more code-knowledgable on the GLA45 stops by, but perhaps that refers to the secondary exhaust valve which actuates near wide open throttle to both produce more sound and also a bit better performance? A number of members here have had to replace the module, but more typically because the spring fails (it is spring normally-closed in more usual driving).

But then I've had an Audi with a "soundaktor" which is an electronic audio device providing artificial exhaust sound augmentation by bouncing waves off the interior of the windshield. So perhaps something similar in the '45?
 
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