DC header question

[HondaFan81]

Engine: F22a1 (91 LX)
Body: 90 EX

I want to get a DC 4-2-1 ceramic coated header, but which do I buy?

Will both the LX & EX DC headers bolt up to the F22a1 (LX) engine?

Are there any advantages on where the O2 sensor is taking readings from, one better than the other?


Note: I'm using a P06 ECU with my setup, so the stock F22a4 (EX) ECU will not be a factor.

[Wallace]

i have an LX, but it's canadian, so i think that's equivalent to the DX in the states.
i got the ceramic DC header used off a guy who had it on his EX-R (again canadian), and it fits great.

the only thing was that i had to change was the location of the O2 sensor. it was located on the down pipe, and i had to change it to the header. this was easy, just unscrew it from the old location and screw it back into the new location.

so, in short, yes i think the LX and the EX headers will fit onto the LX engine.

but, please correct me if i'm wrong.

[HondaFan81]

I think the DX, LX headers have the O2 sensor on the exhaust manifold, whereas the EX version has it on the downpipe.

So if I get a EX DC header and mount it to my F22a1 engine, can I just leave the O2 sensor hooked up on the downpipe?

Is it better for the O2 sensor to be located on the exh. manifold or downpipe?

[Wallace]

if you leave the O2 sensor on the downpipe, the wire will not be long enough to plug it in.

you will have to move it to the manifold like i did.

[HondaFan81]

Where is the O2 sensor wire coming from?

I guess this determines everything it seems.

Also, is the O2 sensor locations the only differences between the DC headers for the LX/DX & EX versions...cuz they are two diff part #'s