WRP Exhale HFC fitting
Exactly, which has three solutions or maybe more and I am leaving them out.
1) Best option-get an aftermarket catback-Yay power!
2) Hope one of your Evo VIII buddies has his intermediate pipe for you to use or obtain one by some other means.
3) Weld a bung into your factory piping
1) Best option-get an aftermarket catback-Yay power!
2) Hope one of your Evo VIII buddies has his intermediate pipe for you to use or obtain one by some other means.
3) Weld a bung into your factory piping
Evolving Member
Joined: Sep 2005
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From: cali
is there a specific direction which the hfc flows? (i.e. shiny side facing ground or dark side facing the ground). there is no indication which is top or bottom or which way the cat flows.
reason why i'm asking is that i got a used works hfc and before trying to mount the hfc, i want to weld an 02 bung on the back end of the hfc pipe.
any suggestions to what angle i should weld the 02 bung?
i apologize for all the questions, just too lazy to go under the car right now.
tia!
reason why i'm asking is that i got a used works hfc and before trying to mount the hfc, i want to weld an 02 bung on the back end of the hfc pipe.
any suggestions to what angle i should weld the 02 bung?
i apologize for all the questions, just too lazy to go under the car right now.
tia!
Last edited by tirbolag9; Apr 10, 2007 at 06:05 PM.
Shiny side should be up. Also, when you are under the car, the flanges from the downpipe and the catback are angled, so I believe it can only fit one way.
I don't think the angle matters, but I would put the O2 sensor in the intermediate pipe of the catback, less heat so it will be easier to remove the sensor if you are switching out parts, then when you get an aftermarket catback that has the bung in it, you can just put the sensor in that.
Honestly, I would just wait until you have atleast an aftermarket catback to install the HFC, you are really not going to gain anything from just changing out that one section.
I don't think the angle matters, but I would put the O2 sensor in the intermediate pipe of the catback, less heat so it will be easier to remove the sensor if you are switching out parts, then when you get an aftermarket catback that has the bung in it, you can just put the sensor in that.
Honestly, I would just wait until you have atleast an aftermarket catback to install the HFC, you are really not going to gain anything from just changing out that one section.
Evolving Member
Joined: Sep 2005
Posts: 145
Likes: 0
From: cali
Shiny side should be up. Also, when you are under the car, the flanges from the downpipe and the catback are angled, so I believe it can only fit one way.
I don't think the angle matters, but I would put the O2 sensor in the intermediate pipe of the catback, less heat so it will be easier to remove the sensor if you are switching out parts, then when you get an aftermarket catback that has the bung in it, you can just put the sensor in that.
Honestly, I would just wait until you have atleast an aftermarket catback to install the HFC, you are really not going to gain anything from just changing out that one section.
I don't think the angle matters, but I would put the O2 sensor in the intermediate pipe of the catback, less heat so it will be easier to remove the sensor if you are switching out parts, then when you get an aftermarket catback that has the bung in it, you can just put the sensor in that.
Honestly, I would just wait until you have atleast an aftermarket catback to install the HFC, you are really not going to gain anything from just changing out that one section.
the exhaust is too pretty to weld a bung on there!the hfc i have has one side of the shield aluminum colored and the other side of the shield is dark/tarnished colored. i guess the side where "off road use only" is printed should be facing the ground?
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Shiny side should be up. Also, when you are under the car, the flanges from the downpipe and the catback are angled, so I believe it can only fit one way.
I don't think the angle matters, but I would put the O2 sensor in the intermediate pipe of the catback, less heat so it will be easier to remove the sensor if you are switching out parts, then when you get an aftermarket catback that has the bung in it, you can just put the sensor in that.
Honestly, I would just wait until you have atleast an aftermarket catback to install the HFC, you are really not going to gain anything from just changing out that one section.
I don't think the angle matters, but I would put the O2 sensor in the intermediate pipe of the catback, less heat so it will be easier to remove the sensor if you are switching out parts, then when you get an aftermarket catback that has the bung in it, you can just put the sensor in that.
Honestly, I would just wait until you have atleast an aftermarket catback to install the HFC, you are really not going to gain anything from just changing out that one section.
So it's a little hard to say that there isn't much to be gained without a catback. But, then again, he's an insane driver.
The WORKS Exhale IP ( http://www.worksevo.com/store/produc...products_id=52 ) has a bung for the O2 Sensor and will bolt right up to all your other stock or WORKS exhaust components 
The HFC will only fit one way front-to-back. (It could still be bolted up incorrectly, but the cat itself would be perpindicular to the ground rather than parallel.) It can be rotate 180* so the stamp is up or down, but should be marked as to what side is the bottom.
Evolving Member
Joined: Sep 2005
Posts: 145
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From: cali
The HFC will only fit one way front-to-back. (It could still be bolted up incorrectly, but the cat itself would be perpindicular to the ground rather than parallel.) It can be rotate 180* so the stamp is up or down, but should be marked as to what side is the bottom.
hi jamie thanks for the response!
the hfc does not specify bottom or top. just only the "off road use only" stamp. i will have to assume that is the bottom? i got this hfc used and i'm planning to weld an o2 bung on it...although i have not yet mounted the hfc.
to be honest, i don't want to lift the car up to check...which explains that i'm trying to take the easy way out by asking. but i'll the bullet and lift the car up and match the flanges and determine where to weld an o2 bung.
Evolving Member
Joined: Sep 2005
Posts: 145
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From: cali
those with a ix...if you want to weld an o2 bung on the hfc weld a bung in the same angle as the o2 bung on the original cat----that's if your catback does not come with an o2 bung like my garage hrs!
actually, "off road use only" should be facing the ground. i finally test fitted the hfc and it only fits one way as per jamie.
those with a ix...if you want to weld an o2 bung on the hfc weld a bung in the same angle as the o2 bung on the original cat----that's if your catback does not come with an o2 bung like my garage hrs!
those with a ix...if you want to weld an o2 bung on the hfc weld a bung in the same angle as the o2 bung on the original cat----that's if your catback does not come with an o2 bung like my garage hrs!