Quote:
Originally Posted by RobMason
Same engine (N55), only it will have 2 turbos, instead of one (according to Scott26). It will be a one series, with modification of the same engine. So it could still have 135 in the name, much the same as the original M535i had the numbers in its name, when introduced in 1984, before the E30 M3.
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IMO its not the same engine if they're redesigning/adding key elements. That's like saying GM's LS motors are all the same even they go way back a very long time.