2001 XJ "power adders"

T

twistedlizard720

NAXJA Forum User
Location
San Gabriel Mtns, CA
I'm considering getting a high flow intake/exhaust system for my '01 XJ. I am curious though about what it will do to performance, mileage, and general reliablility to the engine.

What brands would you recommend?

Remember my '01 has all the fancy electric stuff on it.

Thanks for the help in advance.
 
marginal increase in performance, negative increase in mileage, no change in reliability.

Leave the stock airbox there, insulate it well and add a high flow filter. Exhaust get a nice mandrel bent 2.25in cat back, a high flow cat, dynomax or borla high flow, and a new down pipe bent to match. replace the header with an apn.
 
I (and those few I have let drive my Jeep) can feel an albeit small increase in felt performance after the bored TB with a rusty intake and high flow intake. The throttle response is increased and that might be the most of it, though.
 
that is about all you get unfortunatly.

You should take the money for intake and exhaust and throw a nitrous setup on there instead. Can't beat the bang for the buck.
 
im curious, does APN make a header with a 2.5" collector?

and if the suspension is partially or completely removed say in the process of installing a lift, can the exhaust manifold be removed and replaced without removing the AC lines?

sorry to hijack, ive been wondering for a while now.
 
steed76 said:
talyn i believe he's referring to the exhaust manifold....:)
Click to expand...

Yes, we know, I said intake manifold when I mean exhaust manifold. Which you still have to remove to change the exhaust manifold. But still, where are the AC lines on the driver side?
 
You'll have to pull both manifolds, so why not just work from above? You also have to pull the PS pump, the electrical connectors, fuel line, and a few vacuum lines. No modifications to the AC system. There are several write ups/how tos and many threads on the APN. This is where research pays dividends.

APN sells just the Edelbrock/Rugged Ridge/Banks knock off, and a stock manifold clone, AFAIK. You could check the website, or contact them to see if they have anything else.
 
hubs97xj said:
You'll have to pull both manifolds, so why not just work from above? You also have to pull the PS pump, the electrical connectors, fuel line, and a few vacuum lines. No modifications to the AC system. There are several write ups/how tos and many threads on the APN. This is where research pays dividends.

APN sells just the Edelbrock/Rugged Ridge/Banks knock off, and a stock manifold clone, AFAIK. You could check the website, or contact them to see if they have anything else.
Click to expand...

Just to clarify. You don't have to actually remove the power steering pump from the vehicle. You can remove your air box and let the pump rest on the fender. You do have to remove the fuel lines so be sure to depressurize the system first by pulling the fuel pump relay when it is running and letting the engine die. Or just carefully relieve the pressure via the schrader valve on the fuel rail.
 
Do you have a two piece exhaust manifold? I'm not 100% sure, but I don't believe the APN will be a direct swap on yours. I'm fairly certain it's been covered around here somewhere.

The APN header does have the bung installed, and bolts up to a stock downpipe (no new cat needed or downpipe needed), but that may be a moot point if it doesn't fit your Jeep.

edit- Check this thread out.
http://www.naxja.org/forum/showthread.php?t=1009317&highlight=*APN*+header+2001&page=2
 
Last edited:
hubs97xj said:
You'll have to pull both manifolds, so why not just work from above? You also have to pull the PS pump, the electrical connectors, fuel line, and a few vacuum lines. No modifications to the AC system. There are several write ups/how tos and many threads on the APN. This is where research pays dividends.

APN sells just the Edelbrock/Rugged Ridge/Banks knock off, and a stock manifold clone, AFAIK. You could check the website, or contact them to see if they have anything else.
Click to expand...

Talyn said:
Just to clarify. You don't have to actually remove the power steering pump from the vehicle. You can remove your air box and let the pump rest on the fender. You do have to remove the fuel lines so be sure to depressurize the system first by pulling the fuel pump relay when it is running and letting the engine die. Or just carefully relieve the pressure via the schrader valve on the fuel rail.
Click to expand...
hmmm... blame this one on driver incompetency then. lol.

i was pricing a few headers around local shops last summer and a (reputable) shop had mentioned removing these lines. that not being something i wanted to mess with, and the shop charging an outrageous installation price, i never went anywhere with it. so that means either the guy was simply trying to get some dinero from me, or wasnt thinking a vehicle specific application. glad i asked, ill do some searching now. thanks a ton.
 
I have a 2001 XJ and I did the airtube and large K&N cone air filter. It helped alot felt peppy and it did improve Gas Milage. not a lot but it did help. The stock box had a little opening for air and I had a K&N filter in there that I didn't notice much difference with. Now on my other 98 xj I have that K&N filter but with a whole saw added some more holes to the stock but I couldn't tell a difference with gas milage or not. Id so no change. What I could tell was the difference between the air cone on the 01 and the stock box up in the mts. The thinner air on the stock box was choking the air intake but the air cone allowed more fresh are thinner air content but more air.
 
hubs97xj said:
Do you have a two piece exhaust manifold? I'm not 100% sure, but I don't believe the APN will be a direct swap on yours. I'm fairly certain it's been covered around here somewhere.

The APN header does have the bung installed, and bolts up to a stock downpipe (no new cat needed or downpipe needed), but that may be a moot point if it doesn't fit your Jeep.

edit- Check this thread out.
http://www.naxja.org/forum/showthread.php?t=1009317&highlight=*APN*+header+2001&page=2
Click to expand...


That's it. I have 2 separate collectors and each one has its own O2 sensor. As far as which Emissions I have, those 2 O2 sensors are all I got in the exhaust.
 
I put on a cone filter where the airbox used to be. It feels like there is more grunt down low. Also makes that cool woooshy noise :D
 
just don't leave the cover on it after you wash the engine.

I put a plastic bag around the one I used to have when I would wash the motor. Went inside to let everything dry one time and came back out in a hurry to run an errand. Shut the hood, jumped in and cranked it up, where it immediately shut back down. Opened the hood and the vacuum from my stroker's intake stroke had sucked that cone filter flat.

Swapped back to the stock air box with a quality paper filter and saw no real difference other than the lack of woosh noises.
 
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