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Tech Answer

Will the performance increase be the same in a highly modified engine compared to a stock engine when using the same NOS kit and jetting?

Not really. In most cases, the percentage of increase is greater from a stock engine because it is not as efficient as the modified engine in a normal non-nitrous mode. However, since the effects of nitrous oxide magnify the output of any engine, the total power output will be much higher in the modified engine.

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