If you are mature with your mods and vigilant about maintenance I see no reason why your car would not make it to 150K (if you keep it that long).
In your case I would run the JB3 at the low boost setting and change that oil twice as much as the factory recommends. Our 135i has had 3 oil changes with ~3K on the clock (a bit excessive for a DD, but we track this car a lot). On the track with the JB3 on low boost we run 100 octane only, although the recommended octane rating is only 91. Taking good care of your stuff doesn't mean we can't have a little fun with them!
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