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Our Mazda RX-8 Decat Downpipe replaces the standard restrictive downpipe and catalytic converter with a stainless steel, 2.75" one-piece item. Increasing the bore of the downpipe and replacing the restrictive catalytic converter allows the exhaust gasses to flow much more freely, increasing the power output of the engine.Features:Manufactured from T304 stainless steel2.75" boreTIG welded, CNC machined flangesGaskets and bolts includedPlease note: sold for off-road/track use only. Will not pass an MOT emissions test.