Catalytic Converters

Discussion in 'Exhaust' started by gm muscle, Dec 12, 2016.

  1. gm muscle

    gm muscle Newbie

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    Hello All,

    I'm getting a PO430 Code (Catalyst Efficiency Below Threshhold) on my '97 K1500 Silverado. Its a single cab, short bed with a 5.7. I checked the torque on all of the exhaust manifold bolts and seems to be good but on cold mornings, it sounds like a diesel truck. Could this be the reason I am getting the code?

    The truck has about 174K miles and still running strong. I bought the truck with 90K miles haven't replaced the converters, so it may be time. Suggestions?

    Also, I priced the converters at the dealer (just in case)...$1300!! I think I might be able to get OEM stuff a little cheaper but its still a ton. I saw some Walkers on Rockauto http://www.rockauto.com/en/moreinfo.php?pk=3381939&cc=1051175&jsn=607

    I know there are some non-OEM parts that you can install and get away with but I was told the Cats aren't one of them.

    What do guys think?
     
  2. LMB1500

    LMB1500 I'm Awesome

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    Last I checked, a cat is a cat, so long as it fits, it's ok.
     
  3. df2x4

    df2x4 Domestics only.

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    $1300 for factory cats is typical stealership insanity. You can run aftermarket cats no problem, however I would recommend sticking to the bolt on type with the intermediate pipe instead of the universal weld in type.

    Look into the Magnaflow intermediate pipe/cat assemblies. Can be bought for around $300, and bolt right up just like an OEM part. Much better bends in the tubing than the factory part as well. I have one on my red truck, love it.
     
  4. df2x4

    df2x4 Domestics only.

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    A little more expensive than I remember, but this should be the Magnaflow part you need. As long as you're not in CA or NY at least. They have a different part for those areas for emission regulations.

    https://www.summitracing.com/parts/mpe-23453
     
  5. Pj_stock

    Pj_stock Newbie

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    I paid $1300 (Canadian) for a magniflow exhaust system on my 98. The muffler shop replaced the original 2-cat system with one cat.
    IMG_0648.JPG
    IMG_0603.JPG
     
    Jorge6.5 likes this.
  6. gm muscle

    gm muscle Newbie

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    Going from two cats to one? Did you have to reprogram the PCM?
     
  7. df2x4

    df2x4 Domestics only.

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    Pretty sure he just relocated the O2 sensors so both sets of them read efficiency on the same cat.
     
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  8. shovelbill

    shovelbill Supporting Member

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    i got mine from here.... http://www.hottexhaust.com/

    Jegs wanted like $576 and Summit wouldn't even send it to NY, the new [email protected] california.

    got it in 4 days
    Order Status Changed
    Hi william

    An order you recently placed on our website has had its status changed.

    The status of order #42070 is now Shipped

    Order Details
    Order Total: $312.46 USD
    Date Placed: 7th Apr 2016
    Payment Method: PayPal,Amex,Discover
    Shipment Tracking Numbers / Links
     
  9. Pj_stock

    Pj_stock Newbie

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    @df2x4 that's right. Just remounted the O2 sensors in series upstream and downstream. Computer is happy
     
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  10. boredandstroked

    boredandstroked Newbie

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    Nope. If the cat isn't as efficiant as the original you can still set off the CEL. And if it doesn't have a CARB number it isn't legal in CA emissions states.
     

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