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Nozzles will also do nothing for power. They will just make it smokey and run hot. These have an injector and not nozzles like a cummins does. You will need a chip and injectors of you want me power.
The are no better then what you have now. The hydra is a chip built by power hungry performance. It allows you to add and remove custom tunes and shift on the fly. It is the best on the market for the 7.3.