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YES, EPA legal converter core (EPA 94106).
YES, includes gaskets and hardware needed for installation in your Miata!
Yes, 2.5 inch stainless pipe and laser cut flanges!
Yes, bolt holes are slotted so you can squeeze this 2.5 inch diameter unit into the factory space... but it has the flow for use with any of our performance Miata exhausts from RoadsterSport to Racing Beat, Borla, etc.
Made in the USA, All Stainless Steel flanges mean years of quality performance and all the stainless parts have a lifetime warranty (300-cell ceramic catalytic converter used on all units sold in 2012 or later includes a 5 yr/50,000 mile manufacturing defect warranty on its housing and 25,000 mile manufacturing defect warranty on the internals).