I am curious to this as well, why is 9psi "harder on the turbos" @ 6k RPM as opposed to 4K RPM? I mean unless they are just saying by the time you go from 3K to 6K you have been maxing the turbos for a few seconds already, thus building up too much heat? It almost seems like it would be easier to hit high boost at higher RPM's due to increased exhaust pressure/heat/speed? That plus wouldn't the engine be "wanting" more air at higher RPM?
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