I thought it was obvious - All proper BMWs should have inline six cylinder engines!
230i with 2.5 litre inline six cylinder turbo.
M2 with 3.0 litre inline six cylinder turbo.
M3 with 3.3 litre inline six cylinder turbo.
This is what was done historically, and there is no problem applying the same scheme with todays turbo charged engines in a performance context.
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