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Upgrading Your ISX Cummins Turbo: The Power Advantage The Stock Turbo Problem For diesel enthusiasts familiar with the ISX Cummins engine, one critical limitation stands out above all others: the severely undersized stock turbocharger. With a tiny 2.6-inch intake wheel diameter, the factory turbo is woefully inadequate for a massive 15-liter powerplant. To put this in perspective, this turbo is comparable to what you'd find on a 6.7L Ram pickup truck - already considered small for that applicati …