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Old 03-27-2012, 08:34 PM   #1
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My first jeep! cracked exhaust manifold question

Hey guys, I just recently became part of the jeep family and love it! However I have seemed to join the cracked exhaust manifold family as well. My question is where can I find "flex Headers" for a 2003 4.0. I only seem to find them up to 1999. Will that one work? Is there a difference between the 99 4.0 TJ and the 2003 4.0 TJ? thanks for your help guys

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Old 03-27-2012, 08:35 PM   #2
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Hey guys, I just recently became part of the jeep family and love it! However I have seemed to join the cracked exhaust manifold family as well. My question is where can I find "flex Headers" for a 2003 4.0. I only seem to find them up to 1999. Will that one work? Is there a difference between the 99 4.0 TJ and the 2003 4.0 TJ? thanks for your help guys

i found one on ebay but i got mine for my 99tj for 100.00 at a local junk yard. they carry new parts too and this is a new ridged one. another jeep short cut that cost me alot.

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Old 03-27-2012, 08:38 PM   #3
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Engines
When you look at the CJs of yore or even the YJs that preceded them, TJ Wranglers could possibly represent the best build fodder the off-road enthusiast was ever presented. Unlike the YJs there were no awkward early years with undesirable drivetrains. Right out of the gate in '97 until the model was discontinued in 2006, Jeep's venerable and ubiquitous 4.0L six-cylinder was offered with very little change. Beginning in 2000 Jeep ditched the simple, but crack-prone tubular exhaust manifold for one with integrated, twin catalytic converters, which makes header upgrades somewhat more expensive. Also in 2000, all Jeep 4.0L engines went to a coil-on-plug ignition system, thus doing away with the distributor and plug wires, and then in 2005 the 4.0L got a revised throttle body. Otherwise through the model run, power and torque numbers on the 4.0Ls are similar, with no significant changes. Four-cylinder engines were the sturdy and almost-adequate 2.5L until Jeep's new DOHC 2.4L appeared in 2003, upping the base engine's available power from 120hp/181lb-ft to 147hp/190lb-ft. Regardless, either four-cylinder is disappointing once a lift and tires are added, so it's still best to hold out for a 4.0L model if you plan on bigger tires, adding armor, and doing more than rock crawling with your TJ.


Read more: Jeep Wrangler TJ Buyers Guide - Jp Magazine
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Old 03-27-2012, 08:57 PM   #4
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Yea iv'e found one for a 99 but it just makes me wonder if it will fit with no issues on my 2003. It says from years 1991-1999. Just curious since I cant find these Flex headers specifically for a 2003. Just don't want to buy them and then it not work for my jeep for what ever reason.
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Old 03-27-2012, 08:59 PM   #5
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Yea iv'e found one for a 99 but it just makes me wonder if it will fit with no issues on my 2003. It says from years 1991-1999. Just curious since I cant find these Flex headers specifically for a 2003. Just don't want to buy them and then it not work for my jeep for what ever reason.

call autozone. they can tell you cause they stock them. doesnt mean you have to buy it but they can look it up.
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Old 03-27-2012, 09:02 PM   #6
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Will do thank you for your help.
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Old 04-09-2012, 06:43 PM   #7
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I have a 99 with a cracked manifold. Would I be able to weld this crack or would that cause some other problems?

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