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B18C swap in 99 EX Civic Header to Cat to Exhaust Help!!! Please!!!

Discussion in 'HYBRID -> EG-EK / DC' started by The Drew, Apr 23, 2009.

  1. The Drew

    The Drew New Member

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    I ordered a JDM B18C swap from HMO and the motor is a 96. The motor sits perfect but my problem is the following:

    - The collector on the JDM B18C exhaust manifold is to big to fit my EX Cat. I think the outlet is 2.5.

    what year USDM GSR Exhaust manifold/header do I need to bolt up to my EX cat?

    Would it be better for me to get a GSR cat. Which year will fit the 99 EX and bolt up to an aftermarket header?

    From what i have seen the 94-97 GSR Exhaust Manifolds/headers are longer and have an o2 bung for the primary o2 sensor in the header. The 98-01 GSR are shorter and the primary o2 is located on the GSR Cat.

    PLEASE HELP!!!!!
     
  2. The Drew

    The Drew New Member

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    Nevermind... just cut the flange off the aftermarket header bolted it up to the cat and welded a piece of pipe from the flange to the header and tapped in for the primary o2...
     
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