Question about 2004 Nissan Quest

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Catalytic Converters It is not a problem. However, I want to know # of Cats 04 Quest has. How many Cats are there? I know there is one cat on each of exhaust manifold. Is there another one just before the main muffler (portion that exhaust pipe's diameter is bigger)? Is this portion considered as Cat?

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  • soochan Nov 03, 2008

    Thank you, jschoon77!
    Looks like none of repair manuals shows that this part is a cat.
    I've replied to Guru's comments the other day (took family to Sequoia Nat'l Park and my Quest stopped running). Now rear cat was replaced but, the mechanic said there may be still pieces of rear cat got stuck in this portion of the cat (I call this section Exhaust Cat). That may be a reason why he felt touch of sluggish acceleration on the freeway. He told me to have muffler shop chop this section of the cat and install universal OBD II cat in there. I have not checked the price at a Nissan dealer, but, this may save a few hundred $$.

  • soochan Nov 05, 2008

    Dear jschoon77,
    Another excellent comments.
    Thanks, again.



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You are correct. That portion of exhaust is indeed a catalytic convertor. This would be in the rear portion of the pipe with a flexible section that goes underneath the oil pan. Then you have a long muffler and a final muffler in the rear of the vehicle.

Nissan Scope Technician- 10+ years experience in Nissan dealership

Posted on Nov 03, 2008

  • Jason Schoonmaker
    Jason Schoonmaker Nov 04, 2008

    I can tell you that Nissan exhaust components are not cheap. But before you have a muffler shop weld in a universal cat, check with your local dealer. This part MAY be covered by Nissan's LIFETIME exhaust warranty. They have offered this for a few years, but haven't advertised it. I'm not sure what they were thinking there. Your dealer's parts department will know this part as a flex pipe or front pipe.

    Good luck and happy motoring!



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