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I have an HX civic (03) I have a HP 4-1 Race header, now, will it fit?, i hope i'm in the right forum if i'm not my bad! ,give me some help please i've been waiting months to put it on, i'm just nervouse to get down there an then everything be screwed up and be in trouble.


NIGHTHAWK1903

 
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lol i had the same problem when i bought my hx 3 years ago. it will fit if its a lx/dx header. the header for the ex will also fit but you just wouldn't have a place to put in your o2 senser

 
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THe Header i have came with the High flow cat which does have a place for the 02 sensor does this help??? r the o2 sensors the same size?

 
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Yes, all the O2 sensors are the same size but maybe aren't in the same place.
At least the LX/DX secondary O2 sensor aren't in the same place of the EX sensor. This is because this (secondary) sensor is after the cat, and the cat aren't in the same place.

Another thing, if your "high flow cat" is a resonator, and not cat, then you need a MIL eliminator to avoid the "cat eficiency" code. You can find one on eBay.

 
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Plus... This is not the forum for that questions, this forum is for DIY's (do-it-yourself).

 
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How do you remove it rom this forum i can't find it

 
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The Header i have has 3 o2 sensor holes an one of the holes has a bung plug in it, it has a place for an o2 sensor in the front top of the header an a hole in the same place as the whole i my cat is the hole placements are identical i just want to know if everything will line up an are the same length, the guy who had the header before me, i don't think he had a mil eliminater????


(The hole that has a bung plug in it is not one of the holes i need to use) the 2 holes that are left open are in the same spot that i need.