FrankNature Posted August 15, 2017 Share Posted August 15, 2017 I have an 05' Outback (2.5L SOHC 5MT) and it just gave me the P0420 code: Catalyst System Below Efficiency Below Threshold Bank. So do I just go and replace both of the Cats? If I got aftermarket will a new catalytic converter improve the sound? Or should I just go with OEM? Any advice would help before I drop a $1k at autozone for both of the Cats. Sorry for sounding like a noob, and if this is the wrong place my apologies. Link to comment Share on other sites More sharing options...
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