I dont personally think a brace would do a lot on the 8 p a3 as the bulkhead is immediatley behind the strut towers effectively bracing them anyway. My previous car a focus st had a brace but the engine was central between the struts with the bulkhead well back so probably benefitted. The audi...
Dont worry about it the air filter is under the engine cover so the air will still be filtered. Might be a tiny bit warmer than normal but no worries I'd say.
Perfectly normal, the ECU can ramp the idle up a bit to compensate for the aircon cutting in or the power steering taking extra power from the alternator.
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