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What size cat to go with my setup?

Discussion in 'General Tech and Maintenance' started by BigBoy, Aug 3, 2005.

  1. BigBoy

    BigBoy Senior Member

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    im gonna go with a carsound cat.

    Im getting the rmf header which has a 2.5 in collector, and my exhaust is 60mm(2.36in). SO should i go with 2.25 or 2.5? I heard somewhere that the cats are measured according to outer diameter and not inner like exhausts and headers are.
     
  2. E_SolSi

    E_SolSi Member of the 20 nut club Moderator VIP

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    get a 2.5"
     
  3. phunky.buddha

    phunky.buddha Admin with a big stick Admin VIP

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    2.5

    They're measured internally, just like all exhaust piping should be.
     
  4. B16CRX

    B16CRX Senior Member

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    2.5". If you get the 2.25 you are going to restrict your flow more than you have with the 60mm exhaust.
     
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