To Gut a cat or not to Gut a cat, that is the question

Discussion in 'Engine & Performance' started by dragracefan, May 15, 2019.

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  1. dragracefan

    dragracefan Member

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    Has anyone who has removed the Catalytic converter noticed a difference in performance or not.

    I am not worried about a check engine light code P0420, I know how to get around that.
     
  2. tidefan1967

    tidefan1967 Senior Member

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    Unless the cat is plugged up there's little to gain by removing it. Now if we were talking about the cats they used in the 70's it would be a different story but modern cats are pretty decent.
     
  3. Tim S

    Tim S Junior Member

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    First off, I have the 8.0L v10. One of my catalytic converters was plugged and when I removed them, there was a definite, but expected increase in power. Alot. I just put catalytic converters back on for inspection and there was a loss of power, just barely enough to notice
     
  4. dragracefan

    dragracefan Member

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    Thanks, the one on my truck has 190k and it was a oil burner. I have this 414 c.i.d. stroker now and the thought crossed my mind, may squeeze a few more HP.
     
  5. Yeret

    Yeret The Village Drunk

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    Modern cats, especially good aftermarket ones, flow well and impede peak power quite little. Actually, the power difference between no cat and a clean one have been shown to be several at most. For several more horsepower, you also get an everlasting CEL and the vehicle becomes technically illegal in most states (whether or not emissions are actually ENFORCED is another matter).

    Cats also make decent mufflers with the right exhaust setup. Me, I'm running a Magnaflow unit with no muffler and the truck is nice and loud but not ridiculously so. I mean, I've driven past many cops with this setup and they've never bothered me. Hell, the few trucks around here that still run twin straight pipes are a lot louder. So, basically, if you lop off the muffler and run a cat, you still yield improved exhaust flow without making things too loud AND you don't have to worry about the other crap that results from not having one.
     

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