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I used 8x30x1.25 bolt (8 hardness) with copper nuts, and copper never-seize. At the auto parts stores and honda and vw I could not find an exhaust bolt of this size. They did have studs but no bolts. After talking to one of the muffler shops they said a #5 or #8 bolt is good, DON'T use a stainless bolt.
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