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Headers 00-01
- Thread starter CherBear
- Start date
JNickel101
NAXJA Forum User
- Location
- Alamogordo, NM
in 2000, emissions changed so you have 2 pre-cats. instead of a single outlet on the header, there are two outlets that branch into the precats. after the precats, the downpipe becomes a single pipe....
I hope that makes sense
I hope that makes sense
- Location
- Thornton, CO
Visual Reference.
Talyn
NAXJA Forum User
- Location
- Radford, Communistwealth of Virginia
Cali emission got the 3 cats and 4 o2 sensors. federal has the same manifold, but the down pipe doesn't have the two pre cats.
So if I buy headers for other years, will they fit my 00?
Talyn
NAXJA Forum User
- Location
- Radford, Communistwealth of Virginia
not with out modifications
So the actual bolt patter on the manifold is different?
JNickel101
NAXJA Forum User
- Location
- Alamogordo, NM
I'm still trying to figure out how I got a supposed Cali Emission-equipped 2000 XJ that was sold originally at a dealership in Texas and spent it's entire life in either TX or NM.....
Talyn
NAXJA Forum User
- Location
- Radford, Communistwealth of Virginia
No, the bolt pattern is the same. The down pipe, o2 sensors and ports are different.
hot_rod_hooligans
NAXJA Forum User
- Location
- Indianapolis
Same here, spent it's entire life in OH, MI, and IN
As for the OP question, they aren't factory, but should give you an idea in the difference.
99 and earlier header:
00 and later header
After market replacement down pipe with pre-cats for TJ, haven't found one for XJs yet:
Last edited:
hot_rod_hooligans
NAXJA Forum User
- Location
- Indianapolis
I guess you could, but then you will start having the problem that caused the change to the 00+ manifolds, the 99- manifolds are notorious for cracking at the bottom collector.
Talyn
NAXJA Forum User
- Location
- Radford, Communistwealth of Virginia
Also, if you have the cali emission package you have to weld in two O2 bungs on the manifold for the upstream O2 sensors, and you then would have to do something with the two down stream sensors.
JNickel101
NAXJA Forum User
- Location
- Alamogordo, NM
I'd wire the two downstream sensors together and use the bung behind the main cat....
LazersGoPEWPEW
NAXJA Forum User
- Location
- Los Angeles, CA
I have an 01 that is California equipped also. I think finding headers for it is just going to be an impossibility. Not like it will improve performance that much anyways.
hot_rod_hooligans
NAXJA Forum User
- Location
- Indianapolis
I know JBA makes 00+ headers, and I believe Borla does too, it's the down pipe that no one seems to make for the XJ.
Borla:
JBA:
I think Rugged Ridge makes some too.
Borla:
JBA:
I think Rugged Ridge makes some too.
- Location
- Thornton, CO
- Location
- Minneapolis, MN
2000 and 2001 use the 0331 which is different than the 0630 head 1999 and older Cherokees have. The 0331 exhaust ports were re-sized and moved. Manifolds/headers for a 1999 and older Cherokee will not seal the exhaust ports on an 0331 head. Headers and stock exhaust manifolds must match the head you have, which is why the manifold/header sellers have the date ranges listed.
Some 2000 and 2001 have the 4 sensors and the pre-cats and some don't.
Talyn
NAXJA Forum User
- Location
- Radford, Communistwealth of Virginia
You have it backwards. A header for a 99 and older will seal a 0331 head. Its the 0331 stock manifold that won't seal the older heads. I have heard of people using the newer manifolds on older heads, but I didn't even like the way the newer gasket looked on the older head. I have heard that an aftermarket 0331 header will work with a 0630 head though as the header ports are larger.
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