exhaust size question jdm itr 4-1

Discussion in 'Air Intake / Exhaust' started by swizz977, Jun 17, 2017.

  1. swizz977

    swizz977 Member

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    hello i plan on swapping a b18c itr with the jdm 4-1 header
    my question is should i run a 2.5 test pipe first and then the 60mm cat back or should i run the 60mm right after the header?

    i plan on keeping the motor stock so what will happen if i run the 60mm right after the header? will i lose low end or top end? also what does this have to do with back pressure?
     
  2. swizz977

    swizz977 Member

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    anyone?
     
  3. b16 mini

    b16 mini Ek9 obsession Staff Member Donator

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    Just run the 60 mm pipe, the collector is unlikely to be a true 2.5 anyway,

    This way there is no step downs in size
     
  4. swizz977

    swizz977 Member

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