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View Poll Results: Which Header to you prefer
Headman Header 42 23.73%
Doug Thorley 93 52.54%
Edelbrock 28 15.82%
Another 14 7.91%
Voters: 177. You may not vote on this poll

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  #41  
Old 08-14-2008, 09:25 PM
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JPSwapMohn JPSwapMohn is offline
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behind the headers..

Quote:
Originally Posted by Herk
Your MPG and performance gains come from whats behind the header as much as from the headers themselves. If you run a 2.25" dual or 3" single exhaust with GOOD muffler(s) you will see a marked improvement over the OEM setup.

Which is the question I am trying to answer for my 78. It has several holes in the exhaust and a broken manifold bolt, so it all needs to come out. Anyone running single 3"? happy with it? Was thinking it might be a good solution since the fuel tank where it is..
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  #42  
Old 08-14-2008, 09:45 PM
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A 3" single flows the same as 2 1/4" duals, or a tad more. Easier to fit.

My comment about the Headmans refers to all of the common headaches with headers. Simply put, many cheaper headers are not quite right out of the box. The flanges may not be flat, you may have to file, beat and tweak them a little.

Headers are an area where you get what you pay for.

Also, unless you have a 4 barrel and a bigger cam, you probably won't see much diference.
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  #43  
Old 08-14-2008, 10:15 PM
mjself mjself is offline
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I have the hedman elite ceramic coated with ball and socket collector flanges in my '84. I like them. I normally like the super comps and sandersons. No leaks and I am running duals to a single magnaflow (dual in dual out (serves as my crossover) not a noticable loss in torque at all plus I increased MPG a bit on the freeway.
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  #44  
Old 08-14-2008, 10:45 PM
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Quote:
Originally Posted by Herk
A 3" single flows the same as 2 1/4" duals, or a tad more. Easier to fit.

Much easier to fit.

I have always been told by a lot of muffler places that for the most torque, you want to run one large pipe (3") into a muffler of your choice. If you want dual exhaust, use a muffler that is single in and dual out. It would be just for the look at that point but that is supposedly how you make the most power.

Let's say theoretically, a company, we'll call them AJ's Off-Road, were looking into doing a cat back system for the FSJ's, should they go with:

1. Single mandrel bent 3" pipe exiting in the stock location

2. Doing like above with the single in, dual out having the driver side exit in a factory fashion

3. Both

or

4. Just bagging the idea, it will never work....
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  #45  
Old 08-14-2008, 10:54 PM
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I have thorley headers and flomaster 40 and man it is deep and loud, wife wears ear plugs when we go out for a cruise.
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  #46  
Old 08-16-2008, 01:28 AM
snoopy snoopy is offline
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Clifford and it leaks big time, and it is still a good alternative to the stock manifold. Does anyone make a decent header for a 258?
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  #47  
Old 10-24-2008, 08:03 AM
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Quote:
Originally Posted by snoopy
Clifford and it leaks big time, and it is still a good alternative to the stock manifold. Does anyone make a decent header for a 258?

A lot of people had fixed their leaky 6-cylinder header (or exhaust manifold) with this:

http://www.bjsoffroad.com/CartGenie/prod-584.htm
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  #48  
Old 11-10-2008, 11:57 AM
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Our new y-pipes are in. These are specially designed for the 80-91 FSJ's and they fit REALLY nice. They don't hang down like the old DT y-pipes. Just thought I would let you know. They are on the website.

Thanks.
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  #49  
Old 11-11-2008, 06:46 PM
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I run Hedman Hedders and maybe they're not great but they work for me and I like them. They also light up in the dark
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  #50  
Old 11-26-2008, 08:40 AM
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  #51  
Old 11-26-2008, 06:22 PM
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Quote:
Originally Posted by TPICherokee
Our new y-pipes are in. These are specially designed for the 80-91 FSJ's and they fit REALLY nice. They don't hang down like the old DT y-pipes. Just thought I would let you know. They are on the website.

Thanks.

Are the y-pipes available seperate from the DT kit? In other words can previously purchased DT headers be upgraded to the newly designed y-pipe?
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  #52  
Old 11-30-2008, 10:33 AM
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cajunKen cajunKen is offline
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I've had a set of hedmans (new in the box) that the PO threw in when I bought the GW. I had been toying with the idea of putting them on with a 3" single exhaust after the 360 needs a rebuild and I throw in a new cam.

I thought I heard something a while back about earlier hedmans being better than the later ones.....anyone know if this is true, and if so, how much earlier are we talking?

Only other header experience I've had was with my '86 Dodge W-150, I put headers, duals & a cam into the 318 it had. Woke the motor up really well, but those headers (Blackjacks, IIRC) leaked like a sieve.
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  #53  
Old 04-15-2009, 09:28 AM
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TPICherokee TPICherokee is offline
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Quote:
Originally Posted by donwag
Are the y-pipes available seperate from the DT kit? In other words can previously purchased DT headers be upgraded to the newly designed y-pipe?

Yes, they are available. If you are interested, give us a call at 253.265.6678.
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  #54  
Old 04-15-2009, 07:51 PM
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Quote:
Originally Posted by TPICherokee
Much easier to fit.

I have always been told by a lot of muffler places that for the most torque, you want to run one large pipe (3") into a muffler of your choice. If you want dual exhaust, use a muffler that is single in and dual out. It would be just for the look at that point but that is supposedly how you make the most power.

Let's say theoretically, a company, we'll call them AJ's Off-Road, were looking into doing a cat back system for the FSJ's, should they go with:

1. Single mandrel bent 3" pipe exiting in the stock location

2. Doing like above with the single in, dual out having the driver side exit in a factory fashion

3. Both

or

4. Just bagging the idea, it will never work....

Does AJ's Offroad have a web site?
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  #55  
Old 04-18-2009, 04:29 PM
rocklaurence rocklaurence is offline
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Ive had several hedders (stainless and coated) and they all leak and even when not leaking theyre noisey. Unless you have an old smog dog with really restictive manifolds its not worth it. The OEM for the last 20 years has done a good job with manifolds and unless your really juicing it up you wont need hedders. Lastly, your only likely going to get half of the gain that the manufacture says that their product produces.
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  #56  
Old 04-18-2009, 07:27 PM
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wow, your post shows that you haven't done your research. There are independent tests on the better brands that show they gain what they claim. As for all leaking, and all being noisy, again the better brands don't have that problem. The leaking headers comes from thin mounting flanges that warp, or using hardware that doesn't lock in place, as well as gaskets that aren't up to the task. For headers being noisy aside from leaks, that is typically due to cheap headers using thin-gauge tubing, which doesn't dampen the sound enough (ie: pacesetter, blackjack, etc.).
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  #57  
Old 04-23-2009, 08:13 PM
rocklaurence rocklaurence is offline
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I disagree, Ive read numerous hedder install and when dyno'd with no other tuning they dont produce. Plus, when you consider $400 + for 3% (7hp) increase and the drawbacks of the hedders there's better places to spend your money. Often, a catback exhaust is better than hedders and only worth the money when the OEM has worn out. With CAFA standard as tight as they are, the OEM's have minimized restriction at the manifolds. I remember the manifolds of the 60's & 70's, hedders and daul exhaust made a major difference. Today its marginal.
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  #58  
Old 04-28-2009, 06:33 PM
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What ever your choice of headers, before installing them make sure you dont have to paint them first. I dont know when they started this idea of not painting with heat resistant paint, but it burns off fast and looks fuggly real fast.
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  #59  
Old 04-30-2009, 06:30 AM
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You definately haven't done much research, the manifolds on the AMC V8 are a 30+ year old design. They didn't change much except for the addition of the smog tubes to keep the government happy. So replacing the 1960's designed log-style manifolds on your AMC V8 will be of benefit to both torque and horsepower, but when you bring fuel mileage into the picture the payback may not be worth it.
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  #60  
Old 05-02-2009, 06:46 PM
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around 70---and earlier amc's were square ports
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its a jeep thing i dont understand either
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