2011 XJL 5.0 P0430 code catalyst low efficiency code
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I have a p0430 code and also a bank 1 or 2 threshold code. I’m sure I may need a catalytic converter but I also wanna know if it’s any performance catalytic converters or is straight pipping a bad idea. I tried that cata clean stuff and it restored some of my power but other than that, I think I need to replace it. Does anyone have an idea on what I should do to fix the issue while gaining more HP
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