Headers and Catalytic Converter Combo

Hi, new nsx owner. Looking into installing headers and getting cats. Currently have stock headers and a straight pipe with gruppe m exhaust. The fumes are killer!

Have researched and might be going with DC Headers and prospeed catalytic converters for Ca compliance.

Any suggestions?


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Look into Comptech headers and sticking with the OEM cats. Or swapping them out when it comes time for smog.

Can't say that DC headers are readily available as I haven't heard anyone get brand new ones for a long time.

Thank you for your input.

Unfortunately the OEM cats that used to be on are no where to be found. I would put them back on if i had them. Will look into comptech headers and others.

The DC headers with the adapters are still available with some vendors as i just found out from bennybenx.


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FYI all good headers fit with cats, as they use the same flange locations.

Thanks. Might just go OEM cats. Just gotta find a set.


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What year is your car?

Hapa88 said:

What year is your car?

Click to expand...

It's a '91.


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If you have a 1991, then you have exhaust manifolds instead of headers. You could take the OEM headers off the 3.2L NA2 cars (1997 and up) and use them. They're good for ~15hp and 10 ft-lbs across the rev range.

Hapa88 said:

If you have a 1991, then you have exhaust manifolds instead of headers. You could take the OEM headers off the 3.2L NA2 cars (1997 and up) and use them. They're good for ~15hp and 10 ft-lbs across the rev range.

Click to expand...

Thanks for the info.


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Check with [MENTION=27958]solidol[/MENTION] , he had some OEM cats in good condition for sale.

Will check with him. [MENTION=28434]jtrikakis[/MENTION] is selling me a pair also.

Thanks for the info.


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DevilDoc1893 said:

Will check with him. [MENTION=28434]jtrikakis[/MENTION] is selling me a pair also.

Thanks for the info.


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Click to expand...

Be sure you get the year specific cats that match the year specific headers and year specific exhaust you plan to run.

Hapa88 said:

Be sure you get the year specific cats that match the year specific headers and year specific exhaust you plan to run.

Click to expand...

[MENTION=28434]jtrikakis[/MENTION] mentioned '91 but have not heard back from him. I already have a gruppe m exhaust on.


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I used the Pride headers and cats. I was very satisfied.

CT headers & pride cats here! Love them!

I have a 91 with Taitec headers and OEM cats and some unkown exhaust. It sounds almost the same as when I had OEM manifold.

I have 91 cats with $50,000 miles, but they won't work with CT headers. Let me know if you are interested. Text/ call me at (916) 215-1387. Stefan

737driver said:

I have 91 cats with $50,000 miles, but they won't work with CT headers. Let me know if you are interested. Text/ call me at (916) 215-1387. Stefan

Click to expand...

Why??

I can't remember why. Can someone else chime in on this? I'll ask Shad when I'm at Driving Ambitions about this. I remember getting a dissertation on why my 91 cats wouldn't work with the CT headers. I needed the 95-97 I believe. I'll find out.

737driver said:

I can't remember why. Can someone else chime in on this? I'll ask Shad when I'm at Driving Ambitions about this. I remember getting a dissertation on why my 91 cats wouldn't work with the CT headers. I needed the 95-97 I believe. I'll find out.

Click to expand...

I asked because I have done this install a few times on 1991's. You do need the proper adapters(part of the CT header kit for 1991) and the cats are fine...

LarryB

procar 100 cell race cats - perfect fitting to my taitec headers and exhaust