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Old 02-26-2011, 09:05 PM   #1
tailhole's Avatar
Join Date: Jul 2010
Location: oxford. ms.
Posts: 938
Lots of header talk

There's been lots of threads on headers for the 4.0 on here and other forms. Than one of my customers brought one in the shop and i liked it. So we went out to my jeep to compare it to a stock one (or i thought). MY 05 has a cast iron manifold. (wth?) Had another guy (mechanic) form a shop across the road looking too, and he never seen a cast manifold on a late model jeep ether.
Sooo. why does mine have one?
Jerry even says all have headers from the factory. And I was under the same impression?

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Old 02-26-2011, 11:03 PM   #2
tailhole's Avatar
Join Date: Jul 2010
Location: oxford. ms.
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So. with me having a cast manifold. I should gain some power from installing a header, stock or aftermarket, right?
still don't understand why everyone has a factory header but me?
Does anyone have any thought on why my 05 X has a cast iron manifold instead of the (norm) header?

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Old 02-27-2011, 03:57 AM   #3
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Join Date: Nov 2010
Location: South East PA
Posts: 379
early pre-2000 tjs come with a single exhaust manifold/header that has alot of strees put on it from thermal expansion and being weighed down by the rest of the exhaust. If i recall the 2000+ jeeps come with 2 headers/exhaust manifolds that also have 2 precats in them and dont have have as much thermal expansion stress. The 2000+ ones are 2 different peices that join a little bit further down into one exhaust pipe.
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Old 02-27-2011, 09:23 PM   #4
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Join Date: Jul 2010
Location: oxford. ms.
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Yea. I know. Mine is like that. Two flanges, two cats, 4 o2's, than down to one pipe. Just like all the others i seen.
BUT i have a cast iron manifold??? Whats up with that? The jeep only had 40,000 miles on it. And doesn't look like anything has ever been done to it, like its been replaced or anything. I've even been looking around on the web to see, nothing, Looks like im supposed to have a tube header of some sort.
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