New Exhaust Question
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Joined: Nov 2002
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From: SouthWestern part of VA
New Exhaust Question
I have a 2001 F-150 4.6 V8 5 speed. I am wanting to fix my exhaust one more time, LOL. I am wanting to cut the factory 4 cats off and replace them with 2 high flow cats (2.5" magnaflow, Part # 94036 or # 94056) . Then run two seperate pipes (2.5") from each cat straight out the back with 3.5" tips.
The Magnaflow # 94036 is Single Sensor Cat and the Magnaflow # 94056 is a Midbed Sensor Cat. Can someone explain to me the differences in the two? You can find them at:
www.carsound.com/catalog/universal/940.aspx
I also have another question concerning the O2 sensor's.
As soon as you come off of the headers you have a O2 sensor plugged into the pipe then you have your precat followed by your Cat with a O2 Sensor plugged inside of it. My question is, What is the purpose of the first O2 Sensor plugged into the pipe? What does it do?
Thanks in advance. Any other advice would help out.
Tator Chip
The Magnaflow # 94036 is Single Sensor Cat and the Magnaflow # 94056 is a Midbed Sensor Cat. Can someone explain to me the differences in the two? You can find them at:
www.carsound.com/catalog/universal/940.aspx
I also have another question concerning the O2 sensor's.
As soon as you come off of the headers you have a O2 sensor plugged into the pipe then you have your precat followed by your Cat with a O2 Sensor plugged inside of it. My question is, What is the purpose of the first O2 Sensor plugged into the pipe? What does it do?
Thanks in advance. Any other advice would help out.
Tator Chip
Senior Member
Joined: Feb 2004
Posts: 10,390
Likes: 10
Hi.
Your link does not work for me.
Regardless, those are the wrong part numbers.
The ones you need are these:
http://www.troyerperformance.com/cgi...atalogno=94306
As for the O2's - the front pair provide the A/F ratio feedback necessary for closed-loop operation of the PCM. The rear one's just monitor the condition of the cats. If you go with these cats, you just need to retain the front pair. Read the text in the above link.
And, lest I forget - a Search will turn up all kinds of additional useful info on this topic
. Please give it a try.
Cheers & good luck!
Rock Chiseler
Your link does not work for me.
Regardless, those are the wrong part numbers.
The ones you need are these:
http://www.troyerperformance.com/cgi...atalogno=94306
As for the O2's - the front pair provide the A/F ratio feedback necessary for closed-loop operation of the PCM. The rear one's just monitor the condition of the cats. If you go with these cats, you just need to retain the front pair. Read the text in the above link.
And, lest I forget - a Search will turn up all kinds of additional useful info on this topic
. Please give it a try.Cheers & good luck!
Rock Chiseler
Member
Joined: Oct 2004
Posts: 71
Likes: 0
From: Chicago, IL
Why in the world would you do that! I'm not saying don't cut off the cats and put two high flow cats on. I'm saying why would you run stright 2.5" pipes all the way back? Your back pressure will be far to low. You'll just rob yourself of hp and torque. What's the point in having a loud truck if you can't back it up with performance. A well built exhaust will give you both a great sound and performane. What your talking about doing will only give you great sound and make your truck slower than it is and hurt you MPG. Put some good performance mufflers on there or at least go with a smaller pipe.