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Cummins Diesel Fuel Injectors: Upgrade with CPP, SAC, S&S, and Exergy Injectors Cummins Diesel Fuel Injectors: Upgrade with CPP, SAC, S&S, and Exergy Injectors Cummins diesel engines are legendary for durability and performance, but even the strongest engines need precise fuel delivery to maximize horsepower and reliability. Upgrading your fuel injectors can dramatically improve performance, efficiency, and longevity. At CPP Diesel, we offer top-quality Cummins fuel injectors&n …