Questions about the catalytic converter
02-05-2015, 08:49 AM
#26
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A healthy rotary will still end up killing the OEM cat. The exhaust is still really hot, and there is still a lot of excess hydrocarbons in the stream. The OEM cat can deal with it for a while, but not forever. I'd guess at an average of 80,000 mile lifespan for an RX-8 cat as long as there are no ignition problems or floods. Either one of those will quickly chop life off.
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