GT-One is all relabeled RF-YamamotoIDK man I am looking at that header, that looks just like my GT-One header.
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Yes that's correct.Looking to the picture i would say almost 100% positive that you need to run the catalytic convertor or test pipes. Those headers should directly replace your exhaust manifold on a 91-94 car bolting directly to the cats... but Adnan can confirm this better for sure...