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Old 08-11-2010, 07:16 PM   #1
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Replacing stock header with aftermarket

Anyone know how much of a headache it is to put a header on a1994 jeep wrangler with a 4.0
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Old 08-11-2010, 08:36 PM   #2
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Its time consuming if you are doing it in your driveway as I have done twice, but not that bad. Took me about 4 hours.

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Old 08-12-2010, 08:03 PM   #3
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I just bought a header for my 95 yj 4.0 what the best way to go about putting one on? I would assume taking the fender off woudld be the best way.
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Old 08-14-2010, 10:48 AM   #4
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I installed a pacesetter header on my baby about a month ago. I didn't remove the fender. Remove the intake and it's smooth sailing after that. Unless you run into the problem of taking off the cat like I did. All in all, if you do it by yourself it will take a few hours.
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Old 08-14-2010, 12:05 PM   #5
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Local exhaust shop is doing the exhaust on it. In a few weeks. running all new pipe from header back. I was gonna but the header on my self to save some cash.

Is the intake on a 4.0l as heavy as 4.2l intake? cause the one on my 78 is heavier then all get out.
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Old 08-14-2010, 10:22 PM   #6
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Remove the Airbox first.
The trick with the Intake is to unbolt it and tip it up out of the way. Then use a bungie or strap to hold it up vertical. If you do it right you won't have to disconnect hardly anything. And you'll have all kinds of room to work.
You may need to use a Creeper to get to the bottom bolts from underneath.
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Old 08-14-2010, 10:26 PM   #7
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ahh you are wise my friend. This trick i shall try. I just out right took the one out of my 78 and holy crap its heavy. even more since my manifold was bolt to the intake as well.... fail


Thanks for the info.

If anyone has any pics of the process that would be great..

-Mike
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Old 08-16-2010, 07:57 PM   #8
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I got one last question about adding a header. Is it the same lenght as the factory one or are they longer or shorter???
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Old 08-18-2010, 12:33 AM   #9
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Quote:
Originally Posted by 78j10
I got one last question about adding a header. Is it the same lenght as the factory one or are they longer or shorter???
Usually the header that is made after market will bolt right on in, who makes it?
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Old 09-13-2010, 02:01 PM   #10
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@ Hyperordie, those bolt ons will provide you with a slight to moderate increase in performance but will do very little for your gas mileage as a matter of fact in most cases it will make it worse.

I had done basically the same thing to my 5.9 ZJ and my gas mileage went from ~18mpg to ~15mpg... I wasn't worried about it though as the whole idea was not better gas mileage but better performance. Stock w/supercharger was 345HP and 485lbs torque, after the intake, exhaust and chip it went up to 395hp and 525lbs torque.

Theoretically you were not lied to because the intake and exhaust combo could yield a mileage increase abate a very slight one, but since you also added the chip which is probably programmed for performance then any gain you may have gotten is completely cancelled out and in your case made worse by the chip. If you purchased the programmable chip then there is a way for you to program it for better fuel economy but your performance will suffer.

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