The tradition derived from extensive car modding community around bimmer (which audi has less of it).
For example, "rear sway bar for e90" is easier to infer than "rear sway bar for 3 series 2004-2013".
And when someone asked "does this sway bar fit my 3 series 2005?". You might be hard to know did xe infer to e46 or e90,
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