Type R Club of America

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?

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.

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?

That's correct the USDM header has a 2" collector. See here where we confirmed this: viewtopic.php?t=1835

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!

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.