Has NISMO on the tailpiece lazer etched, Nismo part numbers on the components, Nisan part numbered plastic bagged gaskets.......now if it is a knock off or not I don't know. I can tell you that the Stainless pipes are not the highest grade of stainless, they have lightly surface rusted. The muffler has not, but it is a better quality of stainless. Other than that it looks great and sounds great, best of all it comes with a larger dia crossover ypipe.