WHICH HEADER

[Flash]

no they dont have a listing. From the research I have done an HO manifold wont bolt up due to the differences in the intake ports. But I DO NOT know this for fact so someone correct me if i'm wrong. if its possible to install an HO intake manifold that would be great as my original plan was to just plug the bung on the renix intake and eliminate the EGR that way with a HO header from APN.


Tom

workaholic, here is some one who has.

http://www.naxja.org/forum/showthread.php?t=904937


Flash

 

[Bones]

You've head huh? I've read, and did the searches. No biggie get what you want, But if you do do a search, try to find someone who has cracked a borla in a 4.0. Haven't found one yet. Stainless..

I've got a Cracked Borla on my XJ right now. Borla won't stand behind it because I don't have the F'N receipt (though they were nice enough to give me advice on how to have it welded ). Header is wrapped with DEI's header wrap and has been on the Jeep for about 70K.

Bones :skull1:

 

[Bones]

My nephew works for Borla, and he told me they haven't gotten a return on a header for any jeep product with a crack for as long as he has been there (about three years) some that were obvoiusly in accidents and crushed, but not heat or a vibration related crack. So have the guy send in the one you saw. They have a lifetime replacement warrenty.

See my last post. Borla would have at least one returned, but after a few years people tend to purge receipts and stuff. It seems to be a convenient way to get out of standing behind their product.

Bones :skull1:

 

[workaholic]

I've got a Cracked Borla on my XJ right now. Borla won't stand behind it because I don't have the F'N receipt (though they were nice enough to give me advice on how to have it welded ). Header is wrapped with DEI's header wrap and has been on the Jeep for about 70K.

Bones :skull1:

Well just a heads up in case you replace the header. Dont use header wrap, it promotes cracking and rust.

Tom

 

[Bones]

Well just a heads up in case you replace the header. Dont use header wrap, it promotes cracking and rust.

Tom

Understood, BUT when I bought the header I chose the Borla because I was told that it would hold up being wrapped and that Borla's Warranty was NOT voided by the covering. Nobody else would warranty their product if it was wrapped...

Bones :skull1:

 

[Michaelarchangelo]

I don't think the wrap caused the crack. I think the crack develops due to worn out motor mounts.

 

[HaleYes]

Understood, BUT when I bought the header I chose the Borla because I was told that it would hold up being wrapped and that Borla's Warranty was NOT voided by the covering. Nobody else would warranty their product if it was wrapped...

Bones :skull1:

Might as well of not been covered. Seeing how well that warranty claim is working out for you.


Hale

 

[Dr. Dyno]

I don't think the wrap caused the crack. I think the crack develops due to worn out motor mounts.

Header wraps CAN cause headers to crack by trapping the heat in the metal and not allowing it to dissipate. It's a simple case of thermal fatigue.

 

[Bones]

I don't think the wrap caused the crack. I think the crack develops due to worn out motor mounts.

No wear on the motor mounts. Got rid of stock mounts years ago. I run M.O.R.E. bombproof mounts. There is no significant movement at my motor mounts.

Bones :skull1:

 

[indianaXJ]

Hay Slo-Sho:

I've got the mike leach header with the Kolak performance exaust, it is a very heavy duty header, and a nice package in general. In my openion it's well worth the money.

 

[etjoyride]

I was wondering. according to the site, the APN header is only good from 91-00. Is there any reason it wouldn't fit an '01 XJ?

 

[Flash]

I guess that you would have to call them or e-mail them but, i didnt thing there was any diff between 99 and 1/2 to 01 but then again, I"m a Renix guy so what would i now!:laugh3:


Flash.

 

[etjoyride]

I don't think there is either. guess i'll just email them.

 

[vetmeister]

Did you find out if the APN header will work on a 01?

 

[Flash]

x2 and if there is a diff.......what is it!:dunno:

Flash.

 

[etjoyride]

Oh ya, sorry guys.
I emailed thme and they just said "NO". they didn't even explain what was different

 

[92DripCherokee]

The APN header wont work for 00 or 01. These years have twin 02 sensors, 1 plumbed into each half of the cast iron manifold. The APN header has no bungs at all, works with 91-99 years having a single upstream O2 sensor in the header pipe.

There are other headers for 00-01, but none as cheap as APN.

 

[Slo-Sho]

Hay Slo-Sho:

I've got the mike leach header with the Kolak performance exaust, it is a very heavy duty header, and a nice package in general. In my openion it's well worth the money.

Thank you for the feedback. I know of a guy that parted out his ZJ and I was on the fence about the purchase of this header b/c of possible fitment issues on the XJ. Glad to know it works.:yelclap:

 

[Flash]

I thing.......any ways, that the 01-02 have a twin header(3 into one pipe and 3 into a neater ext pipe).......so if they did build one it would have to be a hole diff design to divide the eng in half for the 2 up stream o2 sensors.

Q: did the cylinder head change come, with the twin header change?

Q: are the head ports the same(would match up with ether header) if the o2 sensor was not a problem(like puting it on a renix?)

Flash.

 

[92DripCherokee]

the exhaust ports for 00-01 head are actually smaller than 91-99, redesigned for lower emissions. The smaller ports constricted exhaust flow to lower NOX emissions, and the intake manifold was redesigned to compensate for the resulting loss of horsepower that came from the smaller exhaust ports..

The APN would bolt on, but the exhaust ports wouldn't match the insides of the header tubes exactly. Not really worth the experiment.

The split exhaust manifold is probably superior to any aftermarket one piece, tri-y header, simply because this split exhaust manifold design does'nt crack.

The irony is, the 00-01 model years split exhaust might BE the reason 0331 heads crack. Both from more uneven heating of the head and the bulkier, heat-trapping intake manifold above it. But that's just my theory...