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Originally Posted by Prodigy 72
So does the Sport button on the 135i act in a similar way to the M button or is there more to it?
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Not at all... The engine may be shared with the 135i (early years) N54 and the Z4 but the M button is only for the 1M. As the article states, this same technology is now being used in the M5, M6 Twin Turbo V8's.
It was pioneered in the 1m since the 1M was the First M car to have a Turbo.