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Discussion Starter #1
i got that dreaded P0420 code. But here is the thing, its all stock. Stock cats, stock exhaust manifolds, stock y-pipe etc. All I have is a cat-back, but that is after the cats, so i don't see how it affects thier performance at all.

I have 88K on the clock, is it possible that one of my cats is dying? BTW, I don't want an O2 sim, i'm just curious of possible causes.

Thanks.
 
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