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Originally Posted by Marwan1
Well then the argument that BMW does not squeeze more power from the M57 (or any other engine of theirs for that matter) so as not to disadvantage other BMW engines doesn't stand, since all turbocharged BMW engines (now the majority of their engines, I think) could be made to produce more power. I still don't understand why BMW would leave that to tuners when it can do it and effectively disadvantage other manufacturers' engine offerings (rather than other BMW engines). Unless other manufacturers can do the same and for some reason (similar or different than BMW's) have also chosen not too...
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I believe that most modern FI motors can output more then the factory offering without hitting it's limits. I call it marketing solution and trying to prolong engine life. There is still a margin of risk present always when you're tuned. You gotta pay to play.