So I have been looking at the old mod of putting a 99+ intake manifold on a pre 99 Jeep XJ.. Anyone who has done this wanna share results?

I have a 1991 XJ, and I am thinking of this mod. What all is needed? I read on one site that the guy used 2000 injectors and had to get a new fuel regulator and some other stuff.. Basically, Im asking is it worth it, what is needed, and how is it done?

Thanks in advance!

 

not sure about the injectors or fuel system but you will need the power steering pump bracket also.

 

Theres a thread floating around that goes into detail specifing the different injectors and FPR's required.

I'm waiting to install a 99 intake right now.
But what I have read is it does not have much advantage over the stock unit.

But I'm gonna take a chance and see for myself later this month.

 

IMO i think its worth it, i have a 00 manifold on my 92 XJ. i actually think just having the newer style belt tensioner was worth it by itself

only new parts i needed for the swap
-00 manifold
-power steering pump and bracket that goes to that year

i re-used my stock fuel rail and TB

i also removed an Idler pulley and had to trim down the timing sight hole a bit to clear the belt

 

Since you asked:
I put an '01 intake on my '96. Pretty straightforward install, just bolts in place. Power steering pump fits the same (AFAIK on older models it's different). Vacuum hoses fit up a bit different. The '01 manifold has different fittings/ports - I modified it before I put it on, to simplify the hosing: The '01 manifold has 3 cast-in nipples on the left side. I ripped these out, and drilled/tapped 1/4" NPT, so I could use fittings of my choice. I could make all the hoses and the IAT sensor fit right up, except I needed to extend one 1/4" vacuum hose. There is a bracket that holds the fuel line up under the manifold - I cut the end off and drilled a new hole in it, to fit the single bolt in the '01 manifold. I used the stock fuel injectors. My throttle body is bored out.

RESULT:

I didn't like it. I felt it had less torque than before (there's a hill on my way home from work - I growl up this hill in 5th gear, 50 mph, 1400 revs. With new manifold I could only hold my speed, with the original manifold I can accelerate slightly). I felt acceleration was "lumpier" than before.
After a couple weeks, I took it off, and put the original back on.

Anybody wanna buy an '01 intake? Nicely cleaned up, all burrs removed (so you don't cut your hands to ribbons installing...) $175. Maybe it would work good with an automatic, where you're never going to pull down at way low revs. Maybe it would work good with bigger injectors - but I don't think so, I monitored my O2 sensor, it was working closed-loop with either manifold (indicating that the ECU was controlling the fuel mixture correctly)

YMMV