I dont really see the big deal with sustaining high speed. It would be one thing if you were under high load the entire time... but once I am finished accelerating, it isnt requiring enough power to sustain these speeds that it even stays in boost. I still have a 100% stock cooling system even the radiator, etc. I have over 18,000 miles with the turbos and while I dont go that fast every day, I do it often enough. I also used to ride the speed limiter pretty often when the engine was mostly stock with stock speed limiter. I really use the power the car has all the time... I wouldnt say I beat on it, but many would look at it that way.
I think that if your tune is good enough, youre fine.
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