USDM ITR Header Selection

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CW FL5 CTR
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USDM ITR Header Selection

Post by CW FL5 CTR » Mon Nov 04, 2024 5:16 pm

I am trying to buy a new header (I don't have the original) that will fit my setup. I have a Tanabe Medallion Touring S exhaust with an OEM style replacement cat. I know I need to be cognizant of the collector size of the header for it to work with the USDM sized cat. From the research I have done, it appears the OEM USDM ITR has a 2" collector. Are there aftermarket headers that are also 2" and fit with the stock cat?
'23 CW FL5 CTR
'98 CW DC2 ITR

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aw614
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Re: USDM ITR Header Selection

Post by aw614 » Mon Nov 04, 2024 6:29 pm

If you can find an OG Comptech or Greddy header for LS/ITR, it would fit. Just make sure if you do find a comptech header do not get the one for the 94-99 GSR that does not have the front o2 bung on it.

I think DC sports also made one that fits too.
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CW FL5 CTR
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Re: USDM ITR Header Selection

Post by CW FL5 CTR » Mon Nov 04, 2024 11:06 pm

Thanks for the info aw614! I believe my car was tuned for a 4-2-1 header (which I'm replacing because it is damaged), what adverse effects are there with going to a 4-1 header? I guess what I'm asking is whether or not it matters if I switch to a 4-1?
'23 CW FL5 CTR
'98 CW DC2 ITR

Dave7CDMTYPER
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Re: USDM ITR Header Selection

Post by Dave7CDMTYPER » Mon Nov 04, 2024 11:21 pm

That's correct the USDM header has a 2" collector. See here where we confirmed this: viewtopic.php?t=1835
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CW FL5 CTR
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Re: USDM ITR Header Selection

Post by CW FL5 CTR » Tue Nov 05, 2024 12:02 am

I see you can still buy the DC Sports Ceramic coated 4-2-1, but it looks like junk IMO especially for the $475 they want for it.

The only other 2" collector header I can find is this ebay no-name header: https://www.ebay.com/itm/364785462142?f ... R-Lo8q7fZA

If anyone has an old header sitting around and wants to get rid of it, let me know!
'23 CW FL5 CTR
'98 CW DC2 ITR

Dave7CDMTYPER
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Re: USDM ITR Header Selection

Post by Dave7CDMTYPER » Tue Nov 05, 2024 12:55 pm

If you're in need, you might have to take what you can find. There are not many options left for usdm headers.

A JDM header/cat/exhaust is much easier if it's doable for you.
ITR CDM 01-1322
2001 GS-R
I have badge #00-1259 in hand.

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