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Aftermarket High Flow Cats vs OE Cats... same performance HUh?

Discussion in 'Performance & Fuel' started by sstoner911, Apr 5, 2011.

  1. sstoner911

    sstoner911 Epic Member 5+ Years 1000 Posts

    I inquired today about high flow cats for my truck today and the first shop wanted $300 installed for Magnaflow I believe...

    Then I called a shop recommended to me by a co-worker -

    I asked what they run and he said " I wouldnt take your money." Then explained that the stock cats are just as efficient as the aftermarket.

    So it looks like I have $300 bucks to put else where huh?
  2. Enkeiavalanche

    Enkeiavalanche Rockstar 4 Years ROTM Winner 5000 Posts

    I have heard the same thing over and over.. Save your money unless they are clogged.. The factory ones are 3 in and very open..
  3. IPFK83

    IPFK83 Rockstar 3 Years 100 Posts

    I have also been told this too but I bought mine anyways b/c I had to redo the entire exhaust system so I figured why not.
  4. sstoner911

    sstoner911 Epic Member 5+ Years 1000 Posts

    One less mod to worry about I guess :)
  5. silveradotrailblazer

    silveradotrailblazer Epic Member 5+ Years ROTM Winner 5000 Posts

    The factory cats are highflow. I went with 1/4" larger diameter cats and "Y" pipe. It made a differance. It complimented the headers and cat-back.
  6. clgoch187

    clgoch187 Rockstar 4 Years 500 Posts

    stock cats ARE high flow cats..... as long as they are in good condition there is no reason to replace them.

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