# of Cats on Fox Body H-Pipe

IHCScoutMan · Sep 8, 2005

Hey Guys, I wanted to know how many catalytic converters come on an OEM H-pipe on a '92 fox body. Or any fox body for that matter.

The reason for the inquiry is that I'm in an argument where i say that the h-pipe had only 2 cats where I am told that there were more, which I have never heard of.

thanks!
~Tom

jstang209 · Sep 8, 2005

4 cats.. theres a set of "precats"

GeLsTaNg215 · Sep 8, 2005

IHCScoutMan · Sep 8, 2005

precats? Where are they located? On the H-pipe?

dead · Sep 8, 2005

Yeah, it's just four cats... two on each side, one after another. Hope you didn't bet any money.

Blakthorn · Sep 8, 2005

4 cats to be removed =)

IHCScoutMan · Sep 8, 2005

naw I didn't bet money, but Pride is on the line, and that can't be bought.

You guys sure the other cats aren't on the down-pipe? cause this diagram shows only two cats.

http://replacement.autopartswarehou...&part=Catalytic Converter&dp=true&showdc=true

I'm goin to bed, thanks for the help fellas

HISSIN50 · Sep 8, 2005

in your link, the second product says it replaces the front and back, left and right cats.
4 is correct. Most aftermarket cats are just one per bank, 3-way catalysts with smog tube hook ups.

ALMOST STOCK · Sep 8, 2005

This question has poped up before, so I decided to take a pic. when I replaced my OEM H-pipe.

As you can see there are 4 cats.
View attachment 504627

IHCScoutMan · Sep 8, 2005

nuts!

...well maybe I can convince this moron otherwise

Thanks for the info

tunedin302 · Sep 8, 2005

IHCScoutMan said:
nuts!

...well maybe I can convince this moron otherwise

Thanks for the info

You're calling him a moron??

StreetStang302 · Sep 8, 2005

I think that they started the 4 cats on the models from 1989 to the Present, but before 1989, I think it was 2 cats on the H-Pipe.

jstang209 said:
4 cats theres a set of "precats"

I was just wondering what you mean by "precats"? Are you referring to the two catalytic converters in the beginning of the pipe as the "precats" or are you referring to the two rear catalytic converters as the "precats"? or is there something besides the 4 cats known as "precats"? Sorry for all the questions, but just curious. Later, Jeff.

jstang209 · Sep 8, 2005

Pre= before

HISSIN50 · Sep 8, 2005

My SD 88 GT vert has 4 cats (or two pre-cats and one 3 way cat - I still have not definitively seen exactly what those little front turds do and I have seen it ref'd as 4 cats and two cat and two precats.).

StreetStang302 · Sep 8, 2005

jstang209 said:
Pre= before

I'm still not understanding you clear enough. Are you saying that the "precats" are 2 of the 4 cats?

Daggar · Sep 8, 2005

My 86 came with 4 cats as well.

95GTAODE · Sep 8, 2005

ALMOST STOCK said:
This question has poped up before, so I decided to take a pic. when I replaced my OEM H-pipe.

As you can see there are 4 cats.
View attachment 504562

To clear it all up: The above picture is correct (with minor differences) for all '86-'2004 'stangs with a factory H-pipe. The pre cats are the 2 small ones right after the header flanges(1 on each side).

Pre '86's did come with 2 or 3 cats, but they were also equipped with either a single('79-'84) or a semi-dual(y pipe to dual mufflers and tails- '85 only) exhausts.

HISSIN50 · Sep 8, 2005

95GTAODE said:
To claer it all up: The above picture is correct (with minor differences) for all '86-'2004 'stangs with a factory H-pipe. The pre cats are the 2 small ones right after the header flange.

You didnt clear it all up for me.

What is the definition of a pre-cat? If going with the idea of a pre-cat and then a cat following (per side), are we to assume the second cat is a 3 way cat?
I have read of this, but also that one cat is a one-way and the second cat (per side) is a 2 way. Which is it?

mustangjoe87 · Sep 8, 2005

StreetStang302 said:
I think that they started the 4 cats on the models from 1989 to the Present, but before 1989, I think it was 2 cats on the H-Pipe.

I was just wondering what you mean by "precats"? Are you referring to the two catalytic converters in the beginning of the pipe as the "precats" or are you referring to the two rear catalytic converters as the "precats"? or is there something besides the 4 cats known as "precats"? Sorry for all the questions, but just curious. Later, Jeff.

nope my 87 had 4 rusty cats

95GTAODE · Sep 8, 2005

HISSIN50 said:
You didnt clear it all up for me.

What is the definition of a pre-cat? If going with the idea of a pre-cat and then a cat following (per side), are we to assume the second cat is a 3 way cat?
I have read of this, but also that one cat is a one-way and the second cat (per side) is a 2 way. Which is it?

Ah Hissin, you're killing me!

Don't take this as gospel, but I've read that the "pre" cats are one ways and that the second is a two way. The pre's are there because they heat up faster and reduce emissions while the car is cold. After market pipes use 2 3-way cats.

# of Cats on Fox Body H-Pipe

IHCScoutMan

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