Getting back to some better discussion here. I'd like to hear from Vishnu or another respected 335i tuner about possible gains and limitations of the S55. There very likely is less margin on this engine compared to some other turbo engines due to BMW focusing on throttle response above max power. That being said, other engines do not automatically come with turbos sized with modding and huge amounts of extra boost. There is undoubtedly some room here as manufactures universally build with large safety and additional margins to deliver good longevity and performance in a wide variety of environmental conditions.
I'll send Shiv a PM.
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