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So the past couple weeks I'll get a p0420 check engine code I reset it with xcal3 and it goes away for a few weeks my mods include tune, mbrp catted downpipe, green filter and front mount intercooler I've never had this issue until this month, I haven't done anything diff and I've had all those mods on my car for over 2 years, if anyone had some thoughts on my problem I'm all ears
 

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So the past couple weeks I'll get a p0420 check engine code I reset it with xcal3 and it goes away for a few weeks my mods include tune, mbrp catted downpipe, green filter and front mount intercooler I've never had this issue until this month, I haven't done anything diff and I've had all those mods on my car for over 2 years, if anyone had some thoughts on my problem I'm all ears
Hi flow cats will still trip a CEL. Defouler.... get 1. I have a j tube defoul off panda motor works website. Using medium inserton my catless mbrp dp. Since u already have a cat u could probally get away with the large insert.

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