Normally aspirated JZ engines are for approximately 400-650 horsepower with the addition of a turbo or a turbo package and without the need of changing the internals dependant upon the engine’s situation. Toyota saved updating the JZ series engines, creating them better and even more long lasting as time passes. https://jaredegicv.blogkoo.com/nissan-rb26-engine-for-sale-options-50799407