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Old 02-08-2012, 05:39 PM   #26
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For either Mugen or ITR header, can I use the JDM primary O2 (LAF) and secondary O2 sensoers?
Because after installing Mugen, CEL comes out after like 15 min. of driving.
I don't have a code yet. I doubt maybe the O2 or reflash...
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Old 02-08-2012, 05:44 PM   #27
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The mugen cat throws a code. I turned it off in K pro but a defouler should do the trick.
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Old 02-08-2012, 06:29 PM   #28
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Originally Posted by caeavesRSX-S View Post
The mugen cat throws a code. I turned it off in K pro but a defouler should do the trick.
Thanks
I thought both Mugen and ITR are similar setups that I didn't know it gives CEL.
I'll try to reset the ECU for just in case.
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Old 02-08-2012, 06:48 PM   #29
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I've also read ITR cat doesn't require a defouler. Is it because Mugen cat has higher flow?
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Old 02-08-2012, 07:15 PM   #30
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ive ran my ITR header for 3 years and havent thrown a CEL. I've also had my reflash for 2 years.
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Old 02-08-2012, 11:37 PM   #31
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Originally Posted by PDXRSX View Post
I've also read ITR cat doesn't require a defouler. Is it because Mugen cat has higher flow?
I would assume that is the case. I went from stock and new 02 sensors and no code to the Mugen and immediately got a code for catalyst efficiency if I remember correctly. So I don't think the sensors went bad during the swap, I was pretty gentle with them, haha.
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Old 02-09-2012, 03:53 AM   #32
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ive ran my ITR header for 3 years and havent thrown a CEL. I've also had my reflash for 2 years.
That is good to know
Have you ever checked its AF ratio?
I may have to worry about it because of the higher flow
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Old 02-09-2012, 04:01 AM   #33
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I would assume that is the case. I went from stock and new 02 sensors and no code to the Mugen and immediately got a code for catalyst efficiency if I remember correctly. So I don't think the sensors went bad during the swap, I was pretty gentle with them, haha.
My sensors are brand-new OEM TYPE R's.
I just wonder the primary O2 is called an LAF sensor for ITR. If it is the reason of CEL, I may need to try the stock primary.

By the way, the power feels great and I really love the quality.
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Old 02-09-2012, 10:42 AM   #34
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Originally Posted by PDXRSX View Post
That is good to know
Have you ever checked its AF ratio?
I may have to worry about it because of the higher flow
AF was adjusted during tuning.

Quote:
Originally Posted by PDXRSX View Post
My sensors are brand-new OEM TYPE R's.
I just wonder the primary O2 is called an LAF sensor for ITR. If it is the reason of CEL, I may need to try the stock primary.

By the way, the power feels great and I really love the quality.
It's also 6.6 pounds lighter than stock.

You should buy a cheap code reader to get the exact code and look it up.
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Old 02-09-2012, 05:31 PM   #35
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It's also 6.6 pounds lighter than stock.

You should buy a cheap code reader to get the exact code and look it up.
Weight reduction is always good
But probably an RBC IM gains some weight.

I unplugged the ECU fuse for a day. If CEL shows up again I'll check the code. Or do I even have to wait until the CEL for a code?
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Old 02-10-2012, 12:11 AM   #36
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Weight reduction is always good
But probably an RBC IM gains some weight.

I unplugged the ECU fuse for a day. If CEL shows up again I'll check the code. Or do I even have to wait until the CEL for a code?
Need to wait.
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Old 02-12-2012, 04:55 PM   #37
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Need to wait.
Found that the error code is P0134 due to the primary.
I may try to reuse the stock primary...
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Old 02-13-2012, 01:45 AM   #38
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the point here is for the price of a new mugen header and cat you can buy TWO custom headers from the likes of hytech, ssr, asp, etc. and make more power. even used you can still buy one of the custom pieces.
The price Mugen wants for their header is ridiculous. I think your better off saving the money and getting a different race header. You can get the Mugen b pipe and axle back from icbmotorsports for under 800, that's for a used 9/10 condition one. I think doing that and getting a custom header from some of the manufacturers mentioned above would be a wiser choice than going the Mugen header route.
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Old 02-20-2012, 03:42 PM   #39
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That is good to know
Have you ever checked its AF ratio?
I may have to worry about it because of the higher flow
I did about a year ago. I don't get a print out but when looking at them the shop said they were fine and I wouldn't have any problems. Before getting the reflash I exchanged several emails with Hondata to make sure it would be okay and they told me that I wouldn't have any issues cuz it still has a cat on the header
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Old 02-21-2012, 08:27 AM   #40
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Need to wait.
It seems like the problem is solved.
I have no CEL now!

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I did about a year ago. I don't get a print out but when looking at them the shop said they were fine and I wouldn't have any problems. Before getting the reflash I exchanged several emails with Hondata to make sure it would be okay and they told me that I wouldn't have any issues cuz it still has a cat on the header
When I have a chance to dyno, I'll also check its A/F ratio.
Not many people have Mugen header...
And I've never heard Mugen header + reflash.
So I assumed ITR header has very similar result, and you have reflash too.

Btw, how is your MPG? Better or poorer than the stock?
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Old 02-21-2012, 06:08 PM   #41
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Vibrant will be re releasing the race header with legal high flow cat in late March. Check my posts for part number and more info. It will produce a lot more power than the other 2 headers and is completely legal.
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Old 02-22-2012, 06:24 AM   #42
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That's good.
Because legal means it doesn't suffer much environment.
I VTEC but won't VTEC without a cat.
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Old 02-22-2012, 06:51 AM   #43
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Search around on here. I know someone used an SSR header and fabbed a high flow cat the same size as the test pipe. Double win here as you get a street legal cat on for day-to-day and you can swap on the test pipe for track days.
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Old 10-25-2018, 05:53 PM   #44
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yes the Mugen exhaust manifold is spendy but that is because there was a lot of engineering behind the making of the header, went to mtec in japan myself and saw how they go about making their headers. They test every small section of the header to get the optimal exhaust flow while maintaining legal requirements...as far as the Japanese emission laws. yes you can save money on a dc race header but you risk a leak and the build material is no where close as a mugen header. If you want quality and performance while maintaining reliability, go mugen, itr, or spoon .2c
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