Do aftermarket headers and exhaust systems really improve fuel economy? - JeepForum.com

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post #1 of 59 Old 05-17-2007, 12:05 AM Thread Starter
CB3
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Do aftermarket headers and exhaust systems really improve fuel economy?

Do aftermarket headers and exhaust systems really improve fuel economy?

I've heard so from a few local guys. They say aftermarket header, exhaust system, and a new chip and the fuel economy goes up. Any truth to that?

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post #2 of 59 Old 05-17-2007, 05:18 AM
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i have an intake and an exhuast and my fuel economy has improved, not by much though, i can tell seat of the pants power aswell.

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post #3 of 59 Old 05-17-2007, 06:39 AM
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after parts and labor....it wont pay for itself. even with these high gas prices

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post #4 of 59 Old 05-17-2007, 07:10 AM
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You can always do labor yourself to save some cash . I guess those mods are more considered cosmetic though. The intake will offer you noticeable performance by the seat of your pants and will sound cool. The exhaust will also sound cool too. Both might offer you 1 mpg or a little more gain. It's all about where you want your money to go. I'd go for it unless you are aiming to buy a lift or diff mods along those lines, which will offer direct obvious performance gains off road.

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post #5 of 59 Old 05-17-2007, 07:44 AM
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it will only take about a 100 years to see the payback.......
you drive a shoe box, the only way to get better milage is not to drive it.

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post #6 of 59 Old 05-17-2007, 10:49 AM
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In a word, no.
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post #7 of 59 Old 05-17-2007, 11:35 AM Thread Starter
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So it helps hosspower, but not gas mileage?

or not gas mileage enough to be worth it for that?

I don't need more power. I'm good there. I want more mpg though.

I know a few local guys who claim to have gained mpg by better intake, Borla header, cat back exhaust of brand I forgot on one guy's rig, and local custom exhaust on other guy's rig, and a new chip.

Actually, I know 4 local guys who've done that. Two claim to have gained 2 mpg. Another claims to have gained 3 mpg, and one claims to have gained 5 mpg.

Now I know these local guys well. I'd say the guys who claim 2 to 3 mpg are reliable, trustworthy guys I'd likely believe, but I still wanted to hear what you guys think cause I'm always a skeptic about mpg claims. However, even if they are telling the truth, which they probably are, it doesn't make it cost effective cause those mods are expensive (and might interfere with skid plates).

The local guy who claims 5 mpg is full of crap in my opinion because he's a known bull pooper. He fools himself, but he ain't foolin anyone else. I really hate BSers.
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post #8 of 59 Old 05-17-2007, 11:45 AM
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The Jeep already has headers. Jeep is under IMMENSE federal pressure to up their CAFE (corporate average fleet economy) mpg averages and if they could further improve on them by a simple exhaust system design change, they'd be all over it.

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post #9 of 59 Old 05-17-2007, 11:46 AM
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OEMs try very hard to get the most MPG they can. This means, making the engine run more efficiently and reducing mass on the vehicle. Aftermarket headers do both. But who trusts the OEMs and their dyno numbers. I am sure they purposely did not make them as efficient as they could

I am sure the aftermarket headers do flow more and weigh less. But at how much of a difference? The money you spend on those will get you a long long way in gas. If you have money to blow, and you might want a coupe extra HP on the butt dyno, then go for it. Otherwise you will gain much better mpg and hp by never filling your gas tank over 1/4 for weight savings.

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post #10 of 59 Old 05-17-2007, 12:02 PM
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Quote:
Originally Posted by CB3
So it helps hosspower, but not gas mileage?

or not gas mileage enough to be worth it for that?

I
Actually, I know 4 local guys who've done that. Two claim to have gained 2 mpg. Another claims to have gained 3 mpg, and one claims to have gained 5 mpg.

Now I know these local guys well. I'd say the guys who claim 2 to 3 mpg are reliable, trustworthy guys I'd likely believe, but I still wanted to hear what you guys think cause I'm always a skeptic about mpg claims. However, even if they are telling the truth, which they probably are, it doesn't make it cost effective cause those mods are expensive (and might interfere with skid plates).

rs.

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post #11 of 59 Old 05-17-2007, 01:25 PM
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And another little tidbit for thought, DO NOT BOTHER REMOVING THE FACTORY HEADER UNLESS IT IS CRACKED ALREADY!!!! It's way too hard to find an aftermarket header that won't crack. So scratch the header idea. If it cracks, then get a cheapo one off of Ebay or the top left of this forum page.

As for a cat-back, you'd likely give up some torque if it increases the tubing size.

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post #12 of 59 Old 05-17-2007, 02:34 PM Thread Starter
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Quote:
Originally Posted by Jerry Bransford
The Jeep already has headers. Jeep is under IMMENSE federal pressure to up their CAFE (corporate average fleet economy) mpg averages and if they could further improve on them by a simple exhaust system design change, they'd be all over it.
Well, they did improve mpg by coming out with the 07 Wrangler version. Correct?

However, that doesn't retroactively help those of us with 06 and older.

I'm not being a smart aleck. It just seems to me that's how it is.
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post #13 of 59 Old 05-17-2007, 02:38 PM Thread Starter
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Anyhow, you guys are making me feel a lot better about having stock header and exhaust system.

How about at least getting a larger catalytic converter and a flowmaster muffler?

Wouldn't that help some and do it on the relatively cheap?
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post #14 of 59 Old 05-17-2007, 02:38 PM
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Quote:
Originally Posted by CB3
Well, they did improve mpg by coming out with the 07 Wrangler version. Correct?
Do you believe that could have been the result of a simple exhaust system modification?

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post #15 of 59 Old 05-17-2007, 02:42 PM
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Quote:
Originally Posted by CB3
How about at least getting a larger catalytic converter and a flowmaster muffler?
Wide open exhausts help increase HP at wide-open throttle and very high RPMs but they don't do anything for fuel economy or around the town/trail performance. Depending on which school of thought you subscribe to, such systems help high-end HP at the expense of low-end torque... which I believe.

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