Got a p0430 code along with a metallic rattle at low RPMs. Not inclined to spend the money on OEM cats. Just wanted to know if the factory sedan exhaust is still relatively quiet with non-resonated HFCs and if you need additional defoulers to avoid popping a code.

 

I have had them for a few years and have never had a code. They are a bit louder than stock and a tiny bit raspy, but it's not that bad..... Once they heat up it's fine.

 

I can live with a little rasp on cold start. Thanks

 

I have also been running Kinetix HFC's for 30k+ miles, never popped a code and did not need O2 extenders.