yes they are

and i would like to put my life on it

mate, these have been around for years, the company that makes them, makes them for over 40 different brands... they are the same headers.. the only ones tomei are slightly different on are the unequal and the twin scroll.. still same material same quality

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Tomei headers are not made in Japan
they are made in Taiwan.. and Taiwan are one of the best manufactures of Exhausts and headers in the world.. most of the Japan exhausts from the big names eg Trust are made in TW

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