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If you buy new plugs that are correct for your car, they normally come pre gapped (particularly platinum and other 'non copper' plugs). I like to run 36/1000 or 0.8mm. But 1.1mm (43/1000) is also common.
if your audi uses a platinum plug (which im almost certain it will based on the year and manufacturer) platinum plugs come pre gapped and do not require gapping
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