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The only way to reduce stress on the turbos under load is for the turbos to not be working as hard.
Mods such as catless DPs and an upgraded IC will help the turbos have to not work so hard to achieve a the same manifold pressure.
Catless DPs reduce the backpressure on the exhaust side of the turbo, allowing it to spin more freely.
An upgraded IC with a lower pressure drop across the cooling bars/fins means there are less losses of pressure from the turbo to the manifold, so the same manifold pressure can be achieved with the turbos boosting less. Obviously the other benefit to an upgrade IC as well is cooler charge air temperatures...cooler denser air will always make more power in our cars...which also may have a benefit to the turbos since higher AFRs mean you can run more advanced timing and therefore less overall boost from the turbos is needed.
BTW, someone correct me if I am wrong on any of this, don't want any misinformation going around.
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