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Old 03-05-2011, 12:50 PM   #1
hefftone79
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Default Bolt on Catalytic converter for EG w/ B18B1 swap

I need a catalytic converter for my 93 Civic CX with B18b1 swap. I'm using the stock B18b header, I have an aftermarket exhaust, but no cat (nor test pipe)

I know that the flanges are rotated between some integras and civics...Is there a stock bolt-in CAT that will fit (aligned bolt holes and proper length). Will a stock integra CAT fit? I need to get emissions done, and plan to keep the car NA during break-in then finishing up the turbo, with a down pipe and 2.5" Cat. But until then, a stock cat will get me by.
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Old 03-05-2011, 12:56 PM   #2
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Default Re: Bolt on Catalytic converter for EG w/ B18B1 swap

I used a OEM B16A header on my B18B1 in my EH3, it was tight but fit and allowed me to use the OEM EH3 cat and exhaust system.

Edit: When I say tight, I mean to the front of the block and oil pan. I had to give a few love taps with a ball peen hammer to one of the lower pipes to get it to clear the block. But it was a temporary engine for me, just needed to get it running.
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Old 03-06-2011, 04:42 AM   #3
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Default Re: Bolt on Catalytic converter for EG w/ B18B1 swap

Thanks for the reply, I don't intend on buying a different exhaust manifold/header. I'd think something will work with the setup I have, whether its Integra, Del sol Vtec, or EK Si.... Anybody know?
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Old 03-06-2011, 08:00 AM   #4
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Default Re: Bolt on Catalytic converter for EG w/ B18B1 swap

a integra cat will work. i have it on my eg with a b18b1 in it.
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Old 03-06-2011, 02:38 PM   #5
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Default Re: Bolt on Catalytic converter for EG w/ B18B1 swap

Awesome, thanks for the reply. I actually live in Dallas, Ga now. As far as the internet goes that practically makes us neighbors.
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Old 03-06-2011, 05:57 PM   #6
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Default Re: Bolt on Catalytic converter for EG w/ B18B1 swap

I believe it's the JDM ITR manifold that the flange is rotated funny. You can always cut the pipe and go to an exhaust shop to get it rewelded.
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Old 03-06-2011, 06:11 PM   #7
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Default Re: Bolt on Catalytic converter for EG w/ B18B1 swap

stock LS manifold/downpipe + DX cat and catback all bolts up IIRC.
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Old 03-21-2011, 06:03 PM   #8
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Default Re: Bolt on Catalytic converter for EG w/ B18B1 swap

I ordered an integra LS "test-pipe" from ebay and the flanges are not lining up....

So frustrated!
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Old 03-22-2011, 02:37 AM   #9
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Default Re: Bolt on Catalytic converter for EG w/ B18B1 swap

Whatever cat. converter you get, if it's doesn't fit then you know what to do. That's the simplest answer to your question. When doing engine swaps, not everything is going to fit between different chassis. Usually, you're b-pipe needs to be shorten.
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Old 04-30-2011, 12:18 PM   #10
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Default Re: Bolt on Catalytic converter for EG w/ B18B1 swap

Trying to figure out what actually fits,.....since I don't have anything to work with at the moment, I will have to buy one......I rather be closer than farther away from gettting this on the road.
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Old 05-13-2011, 02:58 PM   #11
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Default Re: Bolt on Catalytic converter for EG w/ B18B1 swap

I ordered a bosal converter for a 94 integra Ls.... it is the correct length, but the three bolt flange is slightly cocked. Converter body seems a little bigger, and may contact the suspension subframe.

I stopped at autozone, picked up a converter for a del sol (basically the same as a civic)...the one I got is Maremont 29132...it is sold as direct-fit, but the three bolt flange is made to slide in to the catalytic converter, then be clamped. This makes clocking the flanges a breeze, but the converter is a tad short (16.5" long) for the clamp, but MIGHT work if welded.....at least this saves having to cut (straight) and reweld..... the pipe diameter does seem a little small, the rear end of the converter is 1-7/8" (ID) pipe, but the pipe that slides into that (with the 3-bolt flange) is 1-5/8" (ID).... That's not exactly ideal stepping up from 1.625 to 2.50....

Another option is Maremont 29183 (for 1995 integra LS), which my autozone rep said is "unavailable through them" (so use google)...... this one is 17.6 inches long so it should be easy to clock and clamp. It uses the same two piece design.
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Old 05-13-2011, 03:13 PM   #12
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Default Re: Bolt on Catalytic converter for EG w/ B18B1 swap

a better picture....
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