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I know that alot of people have boycotted the hp racing header so I found some facts on it, It does fit although if your installing it yourself u will need to do some grinding. Heres the info: from thecivicstore.com ". The header has two O2 sensor plug locations but some people have said
their "check engine" light comes on sometimes and others have not had the
problem. I have not seen the header installed but have talked to customers
who have and they said they shaved nearly 1/3 of the mount to install the
header but felt confident the integrity of the mount was still ok. We have
recommended people only install it with a lift and hoist to try to avoid
that and again you must realize this is not street legal and will not pass
emissions if testing is done in your state. The only shop who said they didn't cut
the mount had the car on a lift and disconnected the motor from the mounts
and hoisted the motor up off the mounts and slightly forward in the engine
bay. They supposedly then installed the header and were able to lower the
motor and reattach it to the mounts somehow without it hitting. The info was
relayed through a salesman at HP Racing so I wasn't talking to the shop
directly."

I hope this helps everyone whos looking for headers

 
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Have you seen the DIY on this site!

 
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No i havent, it wasnt in the DIY section and it still has that "dont buy thing" in the parts section, So i thought you all would apriciate this,gee my bad, I wont share anymore.

 
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sorry after I posted it sounded rude, I was serious not flameing. But you are right in what you said, and hp also has a 4-2-1 that does not require modding to install, but it gives a few less hp. Anyone know what the kamikaze header produces?

 
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Old news. You'll find everything you need to know about the HP header in the Other Products And Parts section. It's at the top.

And it will pass emissions. People tend to think that just because you've changed the cat converter on the car, you're gonna fail emissions in our cars. But if it was the cat alone that was responsible for the car being ULEV, we'd have FAR more power to our cars. Well, it's not. It's also in the engine itself which makes it ULEV. The only thing that makes it illegal for street IS the cat converter but because you've changed the original cat, THAT makes it illegal. If you take it to get smogged, you'll pass the smog test but fail the visual.

The Kamikaze header I hear produces a bit more horsepower than the HP 4-1 with high flow cat because the Kamikaze has no cat what-so-ever. Plus it requires no cutting for the motor mount. If you don't understand, take off your cat and see how hollow it is.

 
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accually the cat that comes witht he HP racing header is hollow. in california it is not legal because you need to have a certain number of holes that filters the exhaust... when i got my medrel bent exhaust system installed, the guy said that this was not a "real" cat, it was the same thing as a resonator... trust me he knows his ish... well anyways when he put in my header, he didn't have to cut anything, he said it fit fine and had no problems... i have an ex auto...

I also got a flex pipe, and a legal high flow cat, he put the bottom sensor on the high flow cat and the first on the lower part of the header... the top hole had a bolt on it...

see pics of the header




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....

That was my point! The stock cat is NOT hollow compared to HP's which is why it provides more horsepower. Did I not already say that?

And you obviously didn't read the thread either! The header fits perfectly for automatics however, it won't fit on the 5-speed. Why? Different transmission and a motor mount on it that gets in the way.

 
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Sorry if my reply sounded rude, I just havent been around much lately and thought I might have had some new info.

 
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im considering buying the hp racing header and hi flow cat, and i have a LX 5-spd. i was wondering if i will need any other special parts to make this header and cat fit, like possibly a sway bar or some other connecting pipe. i think the hp racing header and cat is made for the ex model, but i have the magnaflow exhaust that comes with both the lx and ex pipes. will all of my pipes fit if i just change my exhaust piping to the ex model that came with the magnaflow?

 
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This product sounds great. The problem being is having to chip off a piece of the engine mount, which hapmers its structural ingetrity. I have the shorty header with downpipe, and i want to switch over to this product to see the differences. But not if it means chipping my mount!!!

 
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ok, i had my car for about a week without a cat on and it was loud like no other.. i was embarassed to drive. with the HP header/cat combo, does it increase the sound or just make it a growling type noise?

 
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isn't kamikaze headers only for LX??

 
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i believe so.. but this thread is for HP racing header.. not kamikaze

 
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is this the hp 4-2-1 header? does it come with a high flow cat too? is there any cutting with the motor mount at all and with anything else?

 
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that header is a tri-y design, but it's not for our civic.

 
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Changing the cat to something less restrictive (another cat, or just a straight pipe) will increase the sound but it won't be as annoying as having no cat. The engine will be louder and so will your exhaust.

 
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"Technically" it sounds like it's made to fit the automatics. With the 5-speed you have a choice to cut the motor mounts or lift the engine.

Buy a new head gasket. As far as I know, that's the only extra part you need which is super cheap anywhere.

 
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HP has a 4-2-1 header but you will get no gains from it. It does not come with a high flow cat because it's 4-2-1 headers are shorter headers. In other words take your stock header for example. Your exhaust manifold is consisted of the header that connects to a downpipe, a downpipe that connects to a cat converter, and a cat converter that connects to your exhaust system. The 4-1 header replaces the downpipe with the header itself and goes straight to the cat converter.

HP might have a downpipe for the 4-2-1 header but what's restricting horsepower is the cat converter. HP might even be selling the cat converter seperately.

 
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what will be a better bang for the bucks. getting a hp shorty header with a down pipe and high flow cat or getting the hp 4-2-1 with a high flow cat? i want something where i can switch it back easily if i don't pass smog.

 
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I have the Hp shorty and the HP racing downpipe the downpipe has a resonator on it no cat

 
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thanks for the reply. where can i get a head gasket, just any car shop or should i go online for one? also do you know a part number so i know im getting the right one?

 
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simple. i'm waiting for a good friend of mine to get licensed to do state inspections. hello illegal mods [IMG]i/expressions/laugh2.gif[/IMG]