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    Thread: Silly question about catalytic converters

    1. Junior Member Westylifestyle's Avatar
      Join Date
      Apr 1st, 2012
      Location
      Studio City, Ca. (SoCal)
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      34
      Vehicles
      82 Vw Vanagon *Donor* 82 Westfalia, 83 w123 300d turbo diesel, 1989 325ic
      05-06-2012 08:58 PM #1
      Edit: This is not an Audi question, just a general question. I thought you Audi guys could answer it better.

      My buddy has a passat. The guy he bought it from put a custom 2.5 inch single pipe exhaust on it, and some aftermarket CAT. He just failed smog and its been determined he needs a new CAT. When we look online, we cant find a 2.5 inch CAT made for a Passat. For instance, this is the only one that pops up for his car. But it's only 2 inch pipe.

      http://www.summitracing.com/search/Y...e/?Ns=Rank|Asc

      So the question is, can he use any 2.5 inch CAT? Or does it have to be for his specific vehicle? Can we grab a 2.5 made for another car if it fits?

      Anyone change their exhaust from stock and had to buy a CAT not made for the vehicle? Are the aftermarkets all made the same internally, just differ in sizes externally?

      Sorry for my ignorance. Neither of us have bought a CAT in ours lives.

      Thanks gents!
      Last edited by Westylifestyle; 05-07-2012 at 01:27 AM.
      German auto freak!!

      Truth is treason in the empire of lies...

    2. Junior Member
      Join Date
      Mar 22nd, 2010
      Location
      Bend, OR
      Posts
      26
      Vehicles
      1995 Audi Sport 90 Quattro
      05-10-2012 07:49 PM #2
      Here is the CAT I used on my 1995 Audi Sport 90 Quattro.
      Summit Racing (CTO-6806)
      It does not have to be car specific, if you are just replacing the CAT.

    3. Member aTOMic's Avatar
      Join Date
      Mar 12th, 1999
      Location
      Tennessee, USA
      Posts
      411
      Vehicles
      2004 A8L ("Platinum Beige Pearl Effect") -- 98 B5 Passat 1.8T, 5M (Elegant Green)
      05-12-2012 12:40 PM #3
      If the car's in Cali, there is some extra reg he'll need to meet as well IIRC. Mo' money of course.

      You'd have better luck posting with the actual question in the title, in a forum for that model (B5) I think.

      HTH (a little)
      -Tom
      tschüß

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