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i installed the dc race header in my 04 ex, but after that i found that the MALFUNCTION INDECATOR LAMP turns on. is it normal just because that stork cat has been removed? how to turn off that lamp. thanks everyone.

 
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did you put on your 02 sincer right?

 
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if its a resonator or a so called highflow cat from ebay then you will need a o2 simulator to turn off the cel. go to www.casperselectronics.com they will have what you need. otherwise there has to be an actual cat in place

 
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you need to make a mechanical o2 sim. there is a diy somewhere.

 
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you dont have a cat so ecu thinks emissions is messed up. you need the 02 sim.

 
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just get spark plug defoulers from autozone and drill one of them out with a 1/2" drill bit. then put them together and hook it up to your o2 sensor.

 
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^^^where do u install the o2 sensor?

 
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i am very surprised that the CEL just turn off automatically just two days after.....and i didnot put the 02 sim on. anyone has the same experience??
i am going to check tomorrow anyway...

 
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i thot ex models dont have 02 sims for headers

 
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the ecu normally readjusts after a few days of running with the cat off. If not summit offers a product to turn it off

 
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Thank You.

So Why Lots Of Menbers Have The Problem With The Race Header....

Is The 04 Ex Model(the Ecu) Different From 02 Or 03 Because I Seen Menbers Have To Get A 02 Sim To Turn The Cel Off.

 
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02 sim is to keep the cel from coming on in the first place. just because the light went out doesnt mean its not there. have it scanned for dtc's and you'll see its still there.

 
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Cel Turns On Anain.....orz...

 
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can you pass an inspection if your CEL isnt on but you do have race headers installed?

 
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I Am In Canada So I Cannot Pass Air Care With The Race Header.

I Did Installed The Header In My Auto Em2.

Ps: I Called Dc Sport And They Said The Cel Turns On Is Normal, And Doesnot Affect The Perfermance At All.
I Am Not A Native Speaker So My English Is Not Good...hope You Understand Waht I Said.....

 
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that is not true. if it sets a cel the ecu goes in to limp mode and you have a consistant afr of 14.7. the problem with this is that you dont need a 14.7 afr all the way across the rpm band. that is the reason why the ecu has preprogrammed cells so this isnt happening. you will lose power like this.

 
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thans. so how do i know my car is in the limp mode? i mean my car is doing fine now.....

useing the 02 sim is the only way to get rid of the cel(limp mode)??

 
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when you have a cel the ecu goes into safe mode/limp mode, get rid of the cel and youll be fine

 
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man,tell me how to get rid of thr cel please...

 
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either an o2 simulator from www.casperselectronics.com or put in an actual cat and not a test pipe/resonator

 
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im at work right now so i cant give you the link for the o2 simulator mod that will definately take off that cel light but when i reach home ill post again with the link...(it has pics as well so i shouldnt b much of a challenge)

 
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its on the site i posted above or here is a direct link to the honda o2 sims

 
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THANK YOU familycar AND Mr_Plenty

BTW, I WANT TO KNOW HOW IS THE CAR DIFFERENT WHEN IT HAVE BEEN DRIVING ON THE SAFE/LIMP MODE???

 
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man i cant believe i forgot the add the link i spok of in my previous post

https://www.casperselectronics.com/M...ory_Code=honda

the car is different. your probably using a bit more gas and dont have as much power as you could.

 
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since i have the megan racing header and test pipe i would need the extention o2 sim right?

would i need a 12 inch or 24 inch or 36 inch?

 
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i dont know exactly where th megan relocates the sensors. if its like the ex exhaust then the front o2 needs to be extended about 12" and the rear about 24". i extended them myself. just make sure not to mix up the 2 white wires and be sure to solder them and put soem cold shrink tape on or heat shrink tubing. do you have the megan parts on now or are they awaiting install for the sim? if you have them on now are you throwing a cel?? if you have them on now and arent throwing a cel then you probably dont need the extended wires becasue they already fit. LOL

 
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How does the header feel? not to hijack

 
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can feel some gain but not much...indeed,sound louder

 
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You will feel gains yes but nothing to brag about. Yes the sound is louder. Honestly, anything is better than stock since the stock pipes are so skinny but id' just get a shorty header to stay emissions legal.

 
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just what exactly is a spark plug defoulers i went to autozone and they ended up giving me a spark plug.