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Hi flow cat's

Discussion in 'The Garage' started by hidesertwheelin, Mar 5, 2005.

  1. hidesertwheelin

    hidesertwheelin 1/2 ton status Premium Member

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    Do hi-flow catalitic converters really work? Do they flow enough to make more power? Mine works fine and but I am wanting to run a 3" hi-flow cat and 3" flowmaster single exhaust on my 90 suburban. I don't want to spend the money on the cat if it's not worth it. Thanks for the help.
     
  2. Fierospeeder

    Fierospeeder Banned

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    the stock exhaust has very low backpressure. And backpressure is needed to help the engine run properly. And some instances help function some emission devices.


    If you want a lot more performance, i would look into removing the old stock exhaust manifolds and getting headers.


    Theres a post not too long ago about a huge debate weather or not exhaust systems work. I can see if i can find it.
     
  3. dirtwarrior17

    dirtwarrior17 Banned

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    backpressure is tricky because you can't just say this system has 3 psi of backpressure... it is constantly changing with the rpms.... at idle any stock system will have less the 1 psi.
     
  4. Fierospeeder

    Fierospeeder Banned

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  5. dirtwarrior17

    dirtwarrior17 Banned

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    i saw a two guys garage where they bent the tailpipe almost shut and got it up to 14 psi... sounded like a go cart. lol
     
  6. Jonny-K5

    Jonny-K5 1/2 ton status

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    if your going to the trouble of putting the flowmaster catback kit on, i'd go with a high flow cat at the same time. especially if your cat is a few years old. you can pick up a high flow for around 50bucks.

    i think any exhaust upgrade on a stock engine will only produce minimal gains in performance. i've got good headers, cat, flowmaster and madrel bent exhaust, barely notice a difference if any. the main reason to do it is for better sound. in the near future i'll be putting in a stronger motor that will need to breathe better, so i had some justification in throwing all the exhaust upgrades at it. that and a cracked manifold to put the mods on the front burner.
     
  7. camiswelding

    camiswelding 1/2 ton status

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    And I just happen to have a hi flo hedman cat 3 inch... with 250 miles on it ... 50 and the ride...
    (I beg to difer with the other poster....you wont get a high quality hi flo cat for 50.00 anywhere)

    cam
     
  8. Jonny-K5

    Jonny-K5 1/2 ton status

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    i think i got mine for less than 50. it was from mudfrog. i forget the brand, but its the most common one i see around at the muffler shops. im sure they cost more if u get them thru a shop.
     
  9. mini_mull

    mini_mull 1/2 ton status

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