I just yesterday started hearing the rattle at lower RPMs idle that seems to be most associated with the internals of one of the stock cats working loose. I plan to check for the other, simpler potential causes (loose heat shield, etc.) as well, but want to plan for a possible replacement of the cats with a used OEM set.

I'm trying to get an idea of which years/models of G37 or other Infiniti/Nissan models I could consider to be good candidates from which to get a set of used OEM cats. Is it specific to those that have the VQ37VHR engines?

Thanks!

 

I have the cats off of a 10 or 11 g37 on my 2007 g35x sedan, from what i could tell when I looked into it, the part numbers changed but the cats are the same/compatible for the G Sedan from 2007-2013 and for the g37 coupe from 2008-2013 and the Q40/60 for 2014...

I haven't had any issues with them

 

Thanks Hashim. I was hoping that would be the case. It gives me a lot more flexibility if I need to hunt for a used OEM set of cats. I'd prefer to get some newer than '07-'08 since that seems to be the period people are reporting the most issues with inadequate internal welds.

 

Do you have RWD or AWD? just get high flow cats and get more powaaah

 

RWD.

I thought about HFC, but I'm not convinced that I'd be happy long-term with the increased noise level. Being in my mid-50's, I like the sound as it currently is. Quiet while just cruising, but with a healthy growl when I get on it.