USDM vs JDM Exhaust Manifold - fit the same or different?

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SKO_ITR
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USDM vs JDM Exhaust Manifold - fit the same or different?

Post by SKO_ITR » Mon Mar 07, 2022 4:03 pm

I believe it's a 4-1 on the JDM and a 4-2-1 on the USDM? Does thee JDM fit on the US car's?

Thanks!

Klasse
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Re: USDM vs JDM Exhaust Manifold - fit the same or different?

Post by Klasse » Mon Mar 07, 2022 9:14 pm

'96 spec jdm has a cast 4-2-1. Everyone forgets that. Unsure of that's the same as the usdm, but i think there is a difference in cat length. Might be made up on the exhaust side.
'97 DB8 Integra Type R, '97 EK1 Civic LXi
ex: '94 CD6 Accord SiR, '92 EG9 Civic SiR, '89 DA6 Integra XSi

9701TypeR
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Re: USDM vs JDM Exhaust Manifold - fit the same or different?

Post by 9701TypeR » Wed Mar 09, 2022 10:15 am

Neither 96 or 98+ will connect to a usdm cat, too short.

SKO_ITR
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Re: USDM vs JDM Exhaust Manifold - fit the same or different?

Post by SKO_ITR » Fri Mar 11, 2022 9:36 pm

Does JDM heat shield fit on USDM header?

9701TypeR
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Re: USDM vs JDM Exhaust Manifold - fit the same or different?

Post by 9701TypeR » Sat Mar 12, 2022 11:39 am

SKO_ITR wrote: Fri Mar 11, 2022 9:36 pm Does JDM heat shield fit on USDM header?
No it will not

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Purplepassiongsr
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Re: USDM vs JDM Exhaust Manifold - fit the same or different?

Post by Purplepassiongsr » Mon Mar 14, 2022 9:34 am

What is everyone using for a high flow cat these days? Looking to get one made up in jdm length. The jdm cat I picked up doesn't have an 02 sensor.


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aw614
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Re: USDM vs JDM Exhaust Manifold - fit the same or different?

Post by aw614 » Mon Mar 14, 2022 8:57 pm

I bought a GESI cat and also a 2.5in adjustable test pipe for the piping so I could get it eventually welded together with flanges.
-Andrew Wong

James0933
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Re: USDM vs JDM Exhaust Manifold - fit the same or different?

Post by James0933 » Mon Mar 14, 2022 10:03 pm

J's racing sells a test pipe in the JDM length with brackets to fit the appropriate oem cat shields for $200. The shields can be purchased from Amayama for about $25 for each piece.

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Purplepassiongsr
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Re: USDM vs JDM Exhaust Manifold - fit the same or different?

Post by Purplepassiongsr » Tue Mar 15, 2022 11:26 am

Thanks for the feedback gents :drink:

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