catalytic converter

[NoelD]

Hello, I'm a new member to this group. Want to ask on my 2007 BMW X5 4.8L, How many catalytic converters do I have? I am trying to source out an A/M ones and found them on ebay, and they are the cat converter attached to the exhaust manifold. So do I have 2 more downstream cats? Thank you for any replies.

[ard]

Hmmm. Maybe the convo should be about why you think you have a bad cat.

[NoelD]

I gutted out the internal honeycomb of my cats since they were melted in due to poor maintenance of the previous owner. I need to replace them with new ones since I need smog in my state. Question is how many cat converters do I have on my 2007 BMW x5, 4.8L. Thanks for any help.

[ard]

Im pretty sure two, one for each bank.


looking on realoem.com, yes two. Zyl1-4 and Zyl 5-8


Zyl = Cylinders

[ard]

One comment.... not sure what you mean by 'poor maintenance'.


Only issues with air/fuel ruin cats...did you fix those issues?




Funny story. MANY years ago I needed a cat for a VW scirocco. Went to a junk yard, dump young kid, and asked if they had any. Counter guy looks me over, says 'cant sell them, thats illegal'. I was crestfallen. Incredulous.... 'really?!?'..... he locked eyes and asked "maybe you mean the pre-muffler?". I pause a beat, and said "Oh, yeah- I need a pre-muffler".

[Cody4130]

You have 2 catalytic converters. They are the ones attached to the exhaust manifolds. Everything after that is mufflers/resonators.