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Cats or no cats?

Discussion in 'Engine / Swaps etc.' started by CaliWagon83, Nov 13, 2017.

?

Do You Still Run a Catalytic Converter on Your Car?

  1. Yes. I love clean air, hummingbirds and frolicking in the field.

    11 vote(s)
    39.3%
  2. No. Gimme fuel, gimme fire, gimme that which I desire!!!

    17 vote(s)
    60.7%
  1. pagrunt

    pagrunt Royal Smart Person

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    With the old 305/dual set up I had a set of universal replacements, am looking at a good set of stainless for the new exhaust. My county in Pa has a visual emissions inspection & gotta run them. Its better than a sniffer test.
     
    • Like Like x 1
  2. ed1948

    ed1948 G-Body Guru

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    [QUOTE="565bbchevy, No cats on the 565 and not even sure if they make them big enough.
    View attachment 77014 [/QUOTE]

    I'm pretty sure cats are available....Problem is - the company would run out of supplies before they're built to your spec.
     
  3. 84slow

    84slow Apprentice

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    Hey 565bbchevy is there a benefit of the h- pipe you got as to a x-pipe. I don't know if I should get that done or not...


    As to cats for me I also do live in Ontario canada I got no cats on my diesel Cummins or my mustang haven't got pulled over yet but a big no no here
     
  4. Pontiac455

    Pontiac455 Master Mechanic

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    MEOW MEOW! RUFF RUFF! MEOW>>>>>>> LMMFAO!
     
  5. pontiacgp

    pontiacgp Canadian Prime Minister

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    these are the cats I have....

     
  6. MrSony

    MrSony Comic Book Super Hero

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    There was an engine masters about that. They were the same within a hp or two of eachother. H pipe sounds throaty-er and is better if you need to take the exhaust off more than a few times. X pipe sounds like a newer car, raspy-er, and is more of a pita to work around.
     
  7. CaliWagon83

    CaliWagon83 Apprentice
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    pontiacgp, interesting video. I know with a lot of newer cars with fuel injection, they actually run a little better with a little backpressure (i.e. cat). Anecdotally, on a Nissan Sentra I had in the mid-'90s, I put a header on it thinking I would pick up all this power, and it actually ran like a dog with it. It ran a lot better with the stock exhaust manifold.
     
  8. online170

    online170 G-Body Guru

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    Hard to take that video seriously when mr. mumbles can barely pronounce the product he's selling.

    Cala-kick-ick.
    Ca-lick-ick
    Cala-lala-ick

    and by the end he was so lazy, they just became Calick converters. Good job!

    palm-face @ back-pressure and the premise of this whole thread.
     
  9. 565bbchevy

    565bbchevy Comic Book Super Hero

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    For me it basically came down to fitment, with my exhaust there would be now way to get an x-pipe in there without interference issues, many people prefer x-pipes but I like the ease of installation of H-pipe which I just call a "balance tube" since that is really the only reason I have it on there but I would take either style over not having something in there.
     
  10. Clone TIE Pilot

    Clone TIE Pilot Royal Smart Person

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    I still run a cat, you can smell if a car has a missing cat and its not pleasant . G bodies came with several different cat designs from the factory, base models had poorer flowing units than the performance models. The MCSS L69 cat is a pretty high flowing unit. The original 231 V6 in my Regal had a much longer but narrower cat than the L69 which is a very wide and short cat, maybe the 231 required more exhaust scrubbing?
     

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