I have an F22... stop laughing.... Back when I was shopping for my exhaust I remember reading that the flanges on the 4thgens where different from the Cat. I'm about to buy a test pipe that has an H22 inlet & an H23 outlet... from what I can remember... I think the inlet side for all the 4thgens are the same. BUT the outlet side is different....
I think the H23 & the F22 share the same outlet... but the VTEC outlet is different. Can some one please confirm that the inlet for all 3 models is the same.... but the outlet is only the same for the S & Si, and is different on the VTEC model.

If this holds true (which I hope it does) this means that I can buy this test pipe that has the h22 inlet (which doens't matter cuz they are all the same) with an Si H23 outlet (which would match mine, if the first paragraph above is correct).

anyone?

thanks!

Ceasar

 

need to know this aswell.

 

You have it correct. The inlet side is all the same. The outlet side is only different for the vtec.

 

It makes you wonder. Why? Is there a reason or a point? I must be not thinking of something...

 

ive yet to be able to come up with any reason other than how the flange sits relative to the ground.....does the inlet side need the clearance because it sits lower or how it is positioned in area? i HATE the prelude flanges....only car to use them boo on honda for that one

 

so if I ordered a h22 cat and picked up a used h22 cat back system, technically it should bolt up?

 

I always thought that the VTEC and SI shared the same outlet and that the F22 was the odd one out.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by TraKtioN &raquo;</TD></TR><TR><TD CLASS="quote">so if I ordered a h22 cat and picked up a used h22 cat back system, technically it should bolt up?</TD></TR></TABLE>

You got it.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by spin_r_g &raquo;</TD></TR><TR><TD CLASS="quote">You have it correct. The inlet side is all the same. The outlet side is only different for the vtec.</TD></TR></TABLE>

its the other way around


inlet to the cat is different

outlet to the exhaust is the same

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 95greenlude &raquo;</TD></TR><TR><TD CLASS="quote">

its the other way around


inlet to the cat is different

outlet to the exhaust is the same</TD></TR></TABLE>

im positive that the outlet to the exhaust is different...i dont know about the inlet

 

^you are wrong

when i ordered my Apexi WS. When i recieved my package it was labeled for the VTEC model. it bolted right up to my SI cat...

 

I need to know before I buy these parts, any others with personal experience or physical access to these parts?

My honda service manual for a 94 prelude says the entire exhaust system is the same except for the manifold and downpipe ofcourse. Its possible they just didnt bother to list the different cat parts, but coming from a service manual I am skeptical.

Even if the inlet is different shouldnt it bolt up anyways or would the gaskets cause interference?

 

bump

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 95greenlude &raquo;</TD></TR><TR><TD CLASS="quote">its the other way around


inlet to the cat is different

outlet to the exhaust is the same</TD></TR></TABLE>

true

for sure

none of you turds better debate it

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 95greenlude &raquo;</TD></TR><TR><TD CLASS="quote">

its the other way around


inlet to the cat is different

outlet to the exhaust is the same</TD></TR></TABLE>

Where did you read that the inlet side is different? If the inlet side is different how come so many people who have done h22 swaps includning myself have re used their si or s cats? The vtec down pipe flange bolts up to the si/s cat fine. If what you're saying is the case no one could re use their si cats.
The outlet side is different. Like I mentioned in the other thread even if the exhaust you put on was labeled for vtec it doesn't mean the cat bolt patten on the cat isn't different. I have 2 explanations for this. First the exhaust manufacturers could have drilled out the holes for the flange with tolerance so that it can bolt up to either cat. This way they can save on cost instead of having to have two models. Not only that it give some play for fitment issues. The different between the 2 cats bolts parterns is so small and only one of bolts doesn't line up Second Honda may changed the cat through the years. Maybe they standardized it or some got mixed up.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by spin_r_g &raquo;</TD></TR><TR><TD CLASS="quote">Where did you read that the inlet side is different? If the inlet side is different how come so many people who have done h22 swaps includning myself have re used their si or s cats? The vtec down pipe flange bolts up to the si/s cat fine. If what you're saying is the case no one could re use their si cats.
The outlet side is different. Like I mentioned in the other thread even if the exhaust you put on was labeled for vtec it doesn't mean the cat bolt patten on the cat isn't different. I have 2 explanations for this. First the exhaust manufacturers could have drilled out the holes for the flange with tolerance so that it can bolt up to either cat. This way they can save on cost instead of having to have two models. Not only that it give some play for fitment issues. The different between the 2 cats bolts parterns is so small and only one of bolts doesn't line up Second Honda may changed the cat through the years. Maybe they standardized it or some got mixed up.
</TD></TR></TABLE>

I know you're not talking to me, but since I reaffirmed his statement I'll tell you this.

I didn't read it you turd, I did it. I have handled all of these parts with my own hands and they go as follows.

EVERY prelude cat outlet is the standard 3 bolt triangle, NONE of them are different. Thats a period on the end of that sentence.

Now, hrm. The jdm h22 cat inlet, the offset triangle, is bigger than the usdm one, so if you try to put a jdm downpipe on your usdm cat, you will have to drill the holes out because they are not spaced closely enough.

The usdm h22 and h23 downpipes themselves are different, but their inlet to the cat is the exact same.

Now, this is the bottom line, as I consider knowledge that I gained first hand to be irrefutable by words, especially ones typed by honda-tech newbs.

If you mean to prove me wrong you better come up with some pictures that explicitly show it, or I'm not buying it.

kthxbye

 

Why buy a test pipe for a f22? Just save your money and do a h22 swap.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by iwubmybb4 &raquo;</TD></TR><TR><TD CLASS="quote">Why buy a test pipe for a f22? Just save your money and do a h22 swap.</TD></TR></TABLE>

Thanks for that ever-so-inspirational comment.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by mgags7 &raquo;</TD></TR><TR><TD CLASS="quote">

I know you're not talking to me, but since I reaffirmed his statement I'll tell you this.

I didn't read it you turd, I did it. I have handled all of these parts with my own hands and they go as follows.

EVERY prelude cat outlet is the standard 3 bolt triangle, NONE of them are different. Thats a period on the end of that sentence.

Now, hrm. The jdm h22 cat inlet, the offset triangle, is bigger than the usdm one, so if you try to put a jdm downpipe on your usdm cat, you will have to drill the holes out because they are not spaced closely enough.

The usdm h22 and h23 downpipes themselves are different, but their inlet to the cat is the exact same.

Now, this is the bottom line, as I consider knowledge that I gained first hand to be irrefutable by words, especially ones typed by honda-tech newbs.

If you mean to prove me wrong you better come up with some pictures that explicitly show it, or I'm not buying it.

kthxbye</TD></TR></TABLE>

I guess I'm a turd then and a HT newb cause I don't spend all my time online posting.

Some how with my turd magical powers I've bolted up my usdm h23 cat to my jdm h22 down pipe with out any modification what so ever.
Since you are the expert here can you tell me why the Greddy SP I bought didn't bolt up to my USDM h23 cat either? The holes on the exhaust pipe flange didn't match up with the USDM h23 cat bolts. I guess Greddy must have screwed up and the one I bought and it was a defect. Other companies must have done the same cause there a numerous explainations about how certain h22 exhausts wouldn't bolt up to the h23 cats with out modifying the flange, yet some people have bolted it up fine.

 

Thats bs, there has to be some diff. btw obd systems here or something.

Its not like I'm lying to you, my jdm downpipe would NOT fit on my usdm cat.

I can't say anything for the greddy exhaust, but I can say that the apexi I had on my car a while ago worked with both those cats.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by mgags7 &raquo;</TD></TR><TR><TD CLASS="quote">Thats bs, there has to be some diff. btw obd systems here or something.

Its not like I'm lying to you, my jdm downpipe would NOT fit on my usdm cat.

I can't say anything for the greddy exhaust, but I can say that the apexi I had on my car a while ago worked with both those cats.</TD></TR></TABLE>

It's not bs. I know several other people who fit the jdm down pipe on a usdm cat as well. That's why I said there were some other factors involved. Honda must have had some inconsistant parts or they switched cats through out the years. If this holds true which is seems like it does the final answer is going to be a hit or miss.

 

Well thats retarded.

I recall my turd statement.

You're not a turd. that guy 98vtec is.

 

funny thing is that both of you are right to an extent....we usually have to drill holes larger to fit the JDM down pipe. but....any aftermarket seems to work fine....stock for stock tho...it doesnt match up EXACTLY.

bascially if youre trying to mate an h22 then buy one MADE for the H22. Otherwise buy the one for YOUR motor. less headache when time comes to install....dont save money and deal with the frustrations.

curious about the H23 downpipe also....weve never reused an h23 downpipe on an h22 swap.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by BlacktraxGirl &raquo;</TD></TR><TR><TD CLASS="quote">
curious about the H23 downpipe also....weve never reused an h23 downpipe on an h22 swap. </TD></TR></TABLE>

pretty sure i've seen one. it was on PO though. some guy had to notch the top of the h23 b-pipe to accomodate the holes. he even had pics.

i went (after my h22a swap) from a 5th gen a/b piece to h23 cat to stock prelude cat-back (with extended b pipe) to a greddy -&gt; 5th gen random tech -&gt; rsr

so its all weird in the end