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355 High Flow Catalytic Converters

Discussion in 'Technical Q&A' started by Smyrna355Spider, Apr 30, 2008.

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  1. Smyrna355Spider

    Smyrna355Spider F1 Rookie
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    #1 Smyrna355Spider, Apr 30, 2008
    Has anyone experienced o2 warning lights or check engine lights after installing high flow cats? I want to install some Hyper flows on my 97 355 but my Mechanics says it is common to have warning lights after switching to high flow. If anyone has experienced this problem or knows a way to avoid it any info would be appreciated.
     
  2. jayt

    jayt Rookie

    Feb 26, 2008
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    #2 jayt, May 1, 2008
    I just had them installed with Fabspeed headers, included new O2 sensors - after 150 miles cel 1-4 came on, then off, etc. Appears to have been bad connection and is fixed - unrelated to new cats. Everything worked great for over a week.
     
  3. Smyrna355Spider

    Smyrna355Spider F1 Rookie
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    #3 Smyrna355Spider, May 2, 2008
    Thanks for the input Jay. I bought Fabspeed cats and headers now so we'll see what happens when I have them put on in a couple of weeks.
     
  4. 285ferrari

    285ferrari Two Time F1 World Champ
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    #4 285ferrari, May 2, 2008
    If you get a CEL it usually is not from the hi flow cats ---O2 sensor maybe...
     
  5. Smyrna355Spider

    Smyrna355Spider F1 Rookie
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    #5 Smyrna355Spider, May 2, 2008
    Rob did you get the high flow cats from fab when you got the headers? I was unsure but finally took the chance yesterday and fab has them on the way to me.
     
  6. jayt

    jayt Rookie

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    #6 jayt, May 2, 2008
    I also got cats from Fabspeed. Work great
     
  7. f355jimv

    f355jimv Formula Junior

    Jan 21, 2008
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    #7 f355jimv, May 2, 2008
    Just had Fabspeed cats installed on my car due to CEL. The OEM cats set off the CEL and now all is good for the car. The car was smogged in CA and passed if that helps.
     
  8. FERRARI-TECH

    FERRARI-TECH Formula 3

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    #8 FERRARI-TECH, May 2, 2008
    We have intalled lots of hyper-flow cats, and never (touch wood) had a CEL problem, I have heard of it on early 360's but it was due to improper instalation of the O2 sensors.
    we have also install a few Fab-speed headers, again with no problem's. Both company's make excellent products and from a shop's stand point, they stand behind their systems. If you have issues I would look towards a sensor and/or instalation issue, I would never question another mechanics work , but We have never had an issue with either of these company's products
     
  9. Marcow930

    Marcow930 Rookie

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    #9 Marcow930, Oct 16, 2008
    After spending a great deal of time running down SD light and CEL light problems I replaced the three ECU'S and now The SD light is off but the R&L cats trigger the CEL and show up as bad cats on the dealer's print out. Who makes replacement cats and/or who rebuilds them? Thanks
     
  10. 285ferrari

    285ferrari Two Time F1 World Champ
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    #10 285ferrari, Oct 16, 2008
    Call Ricambi and get some HyperFlows!!!
     
  11. mgbaker68

    mgbaker68 Rookie

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    #11 mgbaker68, Oct 29, 2008
    I have a stock driver's side cat that's in good shape if you're interested.
    Mark
     

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