my mine also does it i have a 2001 s3 i dont even think if as long as 2 second its the second i turn the engine over then its back to a nice low growl i asked the guys that tune my car they said its just the sound of the audi engine starting up no problem at all so i wouldnt worrie m8 aslong as u get your oil and filter changed every 6k or so your engine will be fine
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