XJ Full Exhaust Swap
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Joined: Jan 2013
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Model: Cherokee
XJ Full Exhaust Swap
So my 96 4.0 HO needs exhaust work bad! The header seems to be cracked and the cat is completely shot! I would like to do a full performance exhaust and an intake.
What companies/vendors/brands is everyone using here?
What companies/vendors/brands is everyone using here?
CF Veteran
Joined: Nov 2011
Posts: 7,387
Likes: 10
From: City of Trees, CA
Year: 93 2 door
Model: Cherokee
Engine: 4.0
this is from JPmagazine 2009
"Header/Manifold Crack Issues
Myth: All 4.0Ls will crack the factory tubular exhaust manifold at the collector. The extra air getting to the O2 sensor will make the Jeep run rich, foul cat, and run like crap. The fix is to add an aftermarket header for more power, durability, and longevity.
Our Thoughts: We agree with the above. The exhaust system of a 4.0L Jeep has to deal with very high temperatures due to the 4.0L's lean air/fuel calibration that, when coupled with a long and inflexible intermediate tube that leverages the tubular header, is a perfect recipe for cracking. In fact, even some aftermarket steel and stainless steel headers may not prove immune.
Claimed Gains: 5-10hp and long-life
Actual Gains: 5-10hp and long-life
Notes: Despite its fairly efficient design, you will notice a seat-of-the-pants improvement with an aftermarket header when used in conjunction with an after-cat exhaust and a cold air intake. Just buy the header with the thickest gauge tubing you can"
Myth: All 4.0Ls will crack the factory tubular exhaust manifold at the collector. The extra air getting to the O2 sensor will make the Jeep run rich, foul cat, and run like crap. The fix is to add an aftermarket header for more power, durability, and longevity.
Our Thoughts: We agree with the above. The exhaust system of a 4.0L Jeep has to deal with very high temperatures due to the 4.0L's lean air/fuel calibration that, when coupled with a long and inflexible intermediate tube that leverages the tubular header, is a perfect recipe for cracking. In fact, even some aftermarket steel and stainless steel headers may not prove immune.
Claimed Gains: 5-10hp and long-life
Actual Gains: 5-10hp and long-life
Notes: Despite its fairly efficient design, you will notice a seat-of-the-pants improvement with an aftermarket header when used in conjunction with an after-cat exhaust and a cold air intake. Just buy the header with the thickest gauge tubing you can"
after reading that, down the road I'm just going to get an APN header as I've read good reviews and the price is right
http://www.jeep-exhaust-manifold.com/
then do some custom 2.5" exhaust tube later with whatever CA legal cat I can find
and if one day I'm feeling saucy, I'm for sure ordering one of these http://www.quadratec.com/products/17006_7101_07.htm
http://www.jeep-exhaust-manifold.com/
then do some custom 2.5" exhaust tube later with whatever CA legal cat I can find
and if one day I'm feeling saucy, I'm for sure ordering one of these http://www.quadratec.com/products/17006_7101_07.htm
CF Veteran
Joined: Feb 2012
Posts: 2,282
Likes: 18
From: central IN
Year: 1997
Engine: 4.0
mine needs the same thing. my plan was to use an obx header, high flow 2.5" cat and find an aftermarket 2.5" muffler/tailpipe combo. while swapping to a 01 intake manifold and making my own cold/ram air intake. my cat is literally falling apart and the manifold is definitely cracked. the rest of the exhaust looks factory stock, it comes complete with a ton of rust, holes, and plenty of leaks.
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Member
Joined: Jan 2013
Posts: 247
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Model: Cherokee
this is from JPmagazine 2009
"Header/Manifold Crack Issues
Myth: All 4.0Ls will crack the factory tubular exhaust manifold at the collector. The extra air getting to the O2 sensor will make the Jeep run rich, foul cat, and run like crap. The fix is to add an aftermarket header for more power, durability, and longevity.
Our Thoughts: We agree with the above. The exhaust system of a 4.0L Jeep has to deal with very high temperatures due to the 4.0L's lean air/fuel calibration that, when coupled with a long and inflexible intermediate tube that leverages the tubular header, is a perfect recipe for cracking. In fact, even some aftermarket steel and stainless steel headers may not prove immune.
Claimed Gains: 5-10hp and long-life
Actual Gains: 5-10hp and long-life
Notes: Despite its fairly efficient design, you will notice a seat-of-the-pants improvement with an aftermarket header when used in conjunction with an after-cat exhaust and a cold air intake. Just buy the header with the thickest gauge tubing you can"
Myth: All 4.0Ls will crack the factory tubular exhaust manifold at the collector. The extra air getting to the O2 sensor will make the Jeep run rich, foul cat, and run like crap. The fix is to add an aftermarket header for more power, durability, and longevity.
Our Thoughts: We agree with the above. The exhaust system of a 4.0L Jeep has to deal with very high temperatures due to the 4.0L's lean air/fuel calibration that, when coupled with a long and inflexible intermediate tube that leverages the tubular header, is a perfect recipe for cracking. In fact, even some aftermarket steel and stainless steel headers may not prove immune.
Claimed Gains: 5-10hp and long-life
Actual Gains: 5-10hp and long-life
Notes: Despite its fairly efficient design, you will notice a seat-of-the-pants improvement with an aftermarket header when used in conjunction with an after-cat exhaust and a cold air intake. Just buy the header with the thickest gauge tubing you can"
after reading that, down the road I'm just going to get an APN header as I've read good reviews and the price is right
http://www.jeep-exhaust-manifold.com/
then do some custom 2.5" exhaust tube later with whatever CA legal cat I can find
and if one day I'm feeling saucy, I'm for sure ordering one of these http://www.quadratec.com/products/17006_7101_07.htm
http://www.jeep-exhaust-manifold.com/
then do some custom 2.5" exhaust tube later with whatever CA legal cat I can find
and if one day I'm feeling saucy, I'm for sure ordering one of these http://www.quadratec.com/products/17006_7101_07.htm
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CF Veteran
Joined: Nov 2011
Posts: 7,387
Likes: 10
From: City of Trees, CA
Year: 93 2 door
Model: Cherokee
Engine: 4.0
They're proven to keep dirt and mud out of your intake. Which is why I want it. But since you are pulling air from outside the engine bay (like a snorkel would) it is a true cold air intake. So technically it should work better than just a cone or some other gimmick "cold air" intake
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Member
Joined: Jan 2013
Posts: 247
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Model: Cherokee
I'm about to order the APN Header from ineedparts.com
Is there anything else I should be throwing in on the order while I'm there? Like injectors or the exhaust flex pipe? If so what model/part numbers should I be getting?
I have a 1996 4.0 HO and I have a 99 intake manifold coming
Is there anything else I should be throwing in on the order while I'm there? Like injectors or the exhaust flex pipe? If so what model/part numbers should I be getting?
I have a 1996 4.0 HO and I have a 99 intake manifold coming