If they're all about consistency, here's a thought: Go back to the days where the last two numbers actually stood for the engine displacement.
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'17 M3 Imola Red/Carbonstructure Cloth, Competition, Lighting, 6MT
Retired: '93 325i |'99 Jeep Wrangler Sport |'06 330i Sport |'08 335i Sport |'08 328i Sport |'09 335d Sport
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