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Old 10-17-2013, 01:46 PM   #1
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Aftermarket exhaust upgrade?

I just got my first Jeep Wrangler and I love it. It was my dad's Jeep and only has 28K miles on it. It's a 1995 with 4.0L.
Does anyone know how much a set of good headers for a 4.0L straight 6 will increase performance/fuel economy? I'm looking at a set of Borla or Pacesetter headers for my 1995 Jeep Wrangler but wanted advice from others that have taken on this project. Is this project worth doing or is the factory exhaust pretty good as it. I'm not sure if it has the factory exhaust as it is a tubular system and not cast iron manifold. The attached picture is very similar to what is on my Jeep. Is this the factory exhaust?

Thanks
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Old 10-17-2013, 01:57 PM   #2
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a 95 with 28k!!!! thats rare to see. I have a 91 yj with 99k. New headers wont do much for fuel economy but performance running might be better. it depends on how much you are going to upgrade. Im sure the jeep is in great condition and probably well maintained since it only has 28k on it. You should just leave it be for now and when you feel like upgrading other parts like fuel injectors and an entire exhaust, rip everything out at once and replace the exhaust manifold. If you are going to get the exhaust manifold in the picture, coat it for maximum protection. Any pictures of your jeep? inside the hood and outside in general?

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Old 10-17-2013, 03:20 PM   #3
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I'm running Borla on my 4.0 with a flowmaster catback, Don't think it helped MPG's but you could feel a power increase especially when accelerating. it's one of the only engine mod I've done which was worth it to me, the other was switching to MSD wires, made my Jeep idle and run smoother (i had cheap wires which were arcing)
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Old 10-17-2013, 04:51 PM   #4
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That is not a factory exhaust, factory is cast iron. I would not replace unless there is a problem with it, ie. cracked. You might get a little better performance with a complete cat back system, but I really don't think its worth the money/effort. An engine is nothing more than a big air pump. If it hasn't already been done I would but on a less restrictive air filter and if the muffler is starting to show its age, put on a high flow muffler, something like a Flowmaster or Magnaflow. Your probably won't see a noticeable increase in power, but your engine will probably run a little smoother.
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Old 10-17-2013, 05:22 PM   #5
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I have a magnaflow set up on mine. Cat delete and a goofy little chrome tip thing. It sounds good and the magnaflow muffler is one of the tougher things under my jeep..

I wouldnt have aftermarket exhaust yet but the jeep came with it..

Dont fix it til its broke in my opinion...
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Old 10-17-2013, 05:39 PM   #6
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The header and cat back made a much bigger difference than the new intake, I really didn't notice any difference with the air tube and K&N. Also if you go with a better intake like K&N use a pre-filter over the K&N filter. We used to build off-road racers and the K&N filter let lots of fine dust in along with lots of air, the pre-filter fixes this weakness. JP magazine did an article on engine mods for power increase, they too felt the header and cat back were the only bolt on mods that had a noticible impact on the dyno test.
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Old 10-17-2013, 06:21 PM   #7
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I would not get the pacesetter header. I had one on my 4.2 and it rusted out within about 5 years, of course I am in PA where everything rusts. Save your money and get a ceramic coated one. A header, high flow cat, and good muffler will give you a noticable increase in power. There was an article in 4 wheel and off road last month testing exhaust, intake, and tuning on a 4.7 V8 Grand.
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Old 10-17-2013, 06:36 PM   #8
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Quote:
Originally Posted by daddyjeep View Post
I would not get the pacesetter header. I had one on my 4.2 and it rusted out within about 5 years, of course I am in PA where everything rusts. Save your money and get a ceramic coated one. A header, high flow cat, and good muffler will give you a noticable increase in power. There was an article in 4 wheel and off road last month testing exhaust, intake, and tuning on a 4.7 V8 Grand.
I agree on not the pacesetter, a ceramic may also help keep the heat down in the engine compartment. I chose Borla because they are stainless steel which will not rust, they have a lifetime warrenty. They changed the smog rules in Cali and required the O2 sensor be below the collectors, they would not pass my Jeep with the older Borla. Borla sent me a new one that was CARB approved free of charge, that's customer service!

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