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It doesn't make sense for a F40 M140i to be using the B48 engine. Current BMW 40i badged cars are using the B58 engine.
As for the possibility of shoe horning a B58 straight six inside the F40's engine bay seems rather impossible even for a transverse mounted B58 might seem a very tight fit? I actually do not think it is possible for a B58 to fit inside a F40's engine bay.
And for a A45S competitor with 470 ponies seems to encroach nearly into the G80 M3/M4 territory. I would think the F40 would stop at the M135i. Usually the top of the line of every series would be M135i, M235i, M340i, M550i, M760Li, M850i. Just 1 M performance vehicle for every series of BMW vehicles.
As for the reason why Mercedes came out with A35 and A45, I'm rather curious on their marketing and product placement strategies. But I'm sure they have done their homework and they have their own reasons for doing so.
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Born in M Town
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