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1/2" thick 1018 MS flange is for the bottom portion of the Evo 8/9 O2 housing. This is a 2.5" flange for 2.5" O2 housings, mates to factory style down pipe. Counter bored for use with a 2.5" OEM donut gasket.
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🇺🇸 Ship from USA · On Agora since 2026
$45.99