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The S80s T6 runs 10.2 lbs boost and has a 2.8 liter displacement
(instead of 2.9 for normally aspirated) on 98 through 01 models.
Latest model is 2.9L. So I think its HPT by the definition applied
to the 70 series (but Volvo has never used the LPT / HPT nomenclature
on the 80 series). In any case, the twin turbo design is what reduces
turbo lag and still allows high boost levels. I think the exhaust
sides (housing) on the turbos is ceramic which might also help retain
heat energy and also reduce lag even further.
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