I got a P0420 code for catalytic inefficiency on my 09 G37x. I read the code and this is for bank 1. which is passenger side based on my search. What are some of your recommendation on replacing this part? I don't want to spend close to $1k dollars to do one side with OEM part since my car already has over 100k miles on it. Is there more economical solution to this problem?

 

time for some high flow cats

 

I thought about that. But then, does that mean I will have to replace both sides?

 

yup, but i think even a pair is less expensive than oem catalytic converter, i think

 

Where are you located? OEM cats come up in the forum classifieds from time to time.

 

$1,000 for 1 oem cat

or

$500 for 2 high flow cats and you gain power. Hard decision.

 

Brand new pair of high flow cats: ~$500
Brand new OEM cat (only one): ~$500
Used OEM cat: $50-100

 

I’m in Texas. I’ll check it out

 

If you really want oem cat used look online there’s always plenty of ppl selling them

 

Some cars still get a P0420 with hi flow cats. Are Infiniti's one of them?

 

depends which ones you get. never got any with fast intentions rhfc

 

No issue with Berks HFC here.

 

Had a 2008 Acura TL with deleted cats for straight pipes. Never had a check engine light. Thanks to defoulers.

Got fast-intentions high flow cats with defoulers on my G37 and never had a P0420. However I got a P2A03 code because my driver side high flow cat developed a crack.

I did buy my high flow cats used from another member and installed them Dec 2015 and put about 40,000 miles on them.