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Discussion Starter · #1 ·
so im looking to get a catback exhaust from ebay but most of them say they wont fit the HF model and that is what i have...others say nothing of it but look the same so im wondering why wont this fit an HF

i dont want to purchase onethat doesnt say it wont fit the HF but then it turns out it wont
 

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Paul said:
so im looking to get a catback exhaust from ebay but most of them say they wont fit the HF model and that is what i have...others say nothing of it but look the same so im wondering why wont this fit an HF

i dont want to purchase onethat doesnt say it wont fit the HF but then it turns out it wont
Isn't the catalytic convertor right up against the exhaust manifold on the HF? A cat-back for a DX/Si is going to start way down behind THAT cat, which way down under the car. I can't see there being any point to putting an exhaust behind a stock HF manifold anyway.

If you are talking about a SWAPPED HF, there's no difference. It will fit fine...it just won't bolt up in place of a stock HF exhaust system, as far as I know.
 

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Discussion Starter · #3 ·
my car has no exhaust period just the exhaust manifold and d0ownpipe and its extremely annoying thats why i want one

its reallllly really loud and annoying

i just want one to bolt right up and be FINE i cant take this extremly loud no exhaust much longer

EDIT

ok so i think ive found the problem here

what im looking at buying is this
http://cgi.ebay.com/ebaymotors/TENRAI-S ... dZViewItem

at the end of the mid pipe it has one of these



what is this 3 bolt pattern supposed to bolt up too?? the downpipe on my car ends with the 2 polt pattern like this



soo is their a diff manifold i can buy or something to make this work because ill do anything to get an exhaust i dont care if i have to ghetto rig it
 

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The back of the cat has the 3-bolt pattern and the front of it has the 2-bolt pattern. The easiest way to fix all this is to buy a new header and exhaust package. It will save you money and should bolt right up.
 

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Dodo said:
The easiest way to fix all this is to buy a new header and exhaust package.
You would still need an adapter. The stock downpipe to cat connection uses spring bolts and a sort of spherical gasket... Together they allow for some flex in the connection so the engine can move without bending the exhaust.
 

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Discussion Starter · #6 ·
ok i dont have that much money to spend on anything to make this work so what do i need to do?? i dont understand what the 3 bolt is supposed to bolt up too because aftermarket headers and downpipes have 2 bolt patterns too?? :?: im reallly confused as of now i just want an exhaust

i need help bad

if anyone can sell me something to make this work that would be nice too

thanks guys
 

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Paul said:
ok i dont have that much money to spend on anything to make this work so what do i need to do?? i dont understand what the 3 bolt is supposed to bolt up too because aftermarket headers and downpipes have 2 bolt patterns too?? :?: im reallly confused as of now i just want an exhaust

i need help bad
OK, the original thing about the HF...the chassis are exactly the same. If you have any other CRX motor swapped in (d16a6, etc), you will be fine with whatever 88-91 exhaust you choose. The only issue, as far as I can guess, is that they say it doesn't fit the HF's STOCK manifold, which is short and has the catalytic convertor on it, so it wouldnt bolt up the same. If you have anything other than the stock HF engine and exhaust manifold, you should be fine.

The stock cat on any of these d-series motors has two-bolt flanges at the front and three-bolt at the back. The two-bolts have spring bolts. Your header, at the collector, should have a two-bolt flange. If you don't have a cat, and you are buying a cat-back exhaust, you will need a cat or a test pipe to fill the space between your header and your new exhaust. The cat-back won't bolt directly to your header, for more reasons than just the flanges.

Tell us what engine and header/manifold you have if you want specific advice...
 

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Discussion Starter · #8 ·
its a stock HF motor.

all thats connected to it is the header and the deal that connects do the header wich is the downpipe im pretty sure.. and that ends in the 2 bolt pattern there is no cat connected to it.

so are you saying that if i get an exhaust its not going to reach all the way to the downpipe? and i need a catylic(spelling) converter inbetween the two..??? that doesnt really make sense to me cause theres already a cat on the exhaust

im so damn confused :idea: :idea: :?: :?: :?: :?:
 

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yes, that is true. the DX and Si models had the cat located after the down pipe. the HF model had the cat located up closer to the exhaust header. all of the exhaust systems in the aftermarket are made primarily for the Si, but they also fit the DX.

If you are running an HF, I would just get a stock replacement from Honda. I don't know how much that would be, but if it would be in the range of $200, I would go for it. If not, get one fabricated for you from a local muffler shop.

You may be able to get an ebay system with another cat to throw on it.
 

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Discussion Starter · #10 ·
ok what would the purpose of 2 cats be??? would it mess anything up?

lets say i could purchase a cheap high flow cat off ebay... would that be the missing link to hook all this up right?
 

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Paul said:
ok what would the purpose of 2 cats be??? would it mess anything up?

lets say i could purchase a cheap high flow cat off ebay... would that be the missing link to hook all this up right?
I am guessing yes. A cheap high flow cat is just a piece of pipe that fits where the cat used to be. I have one on my Si. It might solve the problem, it might not. I don't know exactly how the HF exhaust system is set up.
 

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Discussion Starter · #12 ·
well the cheapest i can find on ebay is 25 dollars shipped for a high flow cat so thats not bad if it will be the missing link to my problem ill try to take some pics to see if i can help out at all
 

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The downpipe and manifold and location of the cat is the difference...
With your stock engine I would look for a std or Si exh manifold and downpipe and stock cat then it will all bolt right up...

I think I have a manifold and a downpipe and a cat and stuff.... I might even have the whole exhaust.....

ill check if you are interested. .

Chris
pm me if you want to know., .
 

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I really wouldn't bother trying to get an aftermarket exhaust to work on an HF, it's still an HF motor. Just take your car to a muffler shop and have an exhaust welded up with a cheap muffler. Problem solved. By the time you buy an exhaust, ship it, and buy the stuff you need to make it work, you could be practically swapping in another d-series.
 

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He's still going to need a cat- no muffler shop will bend up a system (and install it) if the vehicle appears to be a street car. The EPA just LOVES to hand out fines for that. A "high-flow" cat from ebay MAY be sufficient, but most don't even resemble a stock cat.

Another option would be to buy a Si/DX catback system and "cat", then get a muffler shop to make an A-pipe to go between the HF manifold and the front of the cat. Better to get a used stock Si/DX manifold and A-pipe to replace the HF manifold- much better flow (not that the HF motor will be able to use it- you might see a drop in low-end torque (what there is in an HF).
 
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