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Old 10-30-2010, 10:29 AM   #1
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JK Exhaust

So I'm thinking about doing the typical intake/exhaust upgrade on my 2010 JKU. I've heard though that there's hardly any back pressure in the JKs to begin with, so I might be better off just doing an intake. Any thoughts on this? Thanks in advance.

Mike

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Old 10-30-2010, 10:32 AM   #2
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Quote:
Originally Posted by MTH
So I'm thinking about doing the typical intake/exhaust upgrade on my 2010 JKU. I've heard though that there's hardly any back pressure in the JKs to begin with, so I might be better off just doing an intake. Any thoughts on this? Thanks in advance.

Mike
Intake is completely useless. Exhaust, LOADS of placebo effect.

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Old 10-30-2010, 11:33 AM   #3
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Not enough pressure release for you to notice a difference. Save the money and modify the jeep in a different way.
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Old 10-30-2010, 11:56 AM   #4
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Quote:
Originally Posted by ncossey

Intake is completely useless. Exhaust, LOADS of placebo effect.
Gonna have to disagree with you cossy, cai helps fuel economy, provides ear candy, and ads a little extra go to my 2010.
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Old 10-30-2010, 12:05 PM   #5
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Originally Posted by stick1001

gonna have to disagree with you cossy, cai helps fuel economy, provides ear candy, and ads a little extra go to my 2010.
x2
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Old 10-30-2010, 01:02 PM   #6
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^ That, stick and jbird, is called, as ncossey said, the placebo effect. DYNO tests (not butt dyno, but Mustang dyno) have shown that the gains are small enough with an intake and exhaust on a standard 3.8L to be inconclusive. There is a torque loss down low (under 3,500 RPM), and maybe 1-4 WHP gain up top (over 4,500 RPM). NOT worth the $500+ you'll spend!

As for improved fuel economy, MAYBE 1/4 MPG. Again, NOT worth the $500+.

The ONLY reason to change out the exhaust is to gain clearance. That's why I did mine. As for the intake, only if you're running a snorkel Mark W.
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Old 10-30-2010, 02:43 PM   #7
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Intake and exhaust will give you more power....if you add headers and a dyno tune. Otherwise if you want a faster jeep just take the doors, top, and backseat out. zoom
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Old 10-30-2010, 04:11 PM   #8
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The ONLY reason to change out the exhaust is to gain clearance. That's why I did mine. As for the intake, only if you're running a snorkel Mark W.
Speaking of moving the exhaust for clearance, have you seen the new Genright auxiliary fuel tank for the JKs?
Very sweet but very very very pricey. I gotta hit the lotto.



Oh. Don't do an intake unless you put a Hemi in first.
Get a nice snorkel or reagear or something.
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Old 10-30-2010, 05:47 PM   #9
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^ Not a fan of moving that much weight further outboard in the vehicle. I like not having all the weight on the right side, but further to the back is not good for handling. Not my style- Mark W.
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Old 10-30-2010, 11:15 PM   #10
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Originally Posted by thaduke2003
^ That, stick and jbird, is called, as ncossey said, the placebo effect. DYNO tests (not butt dyno, but Mustang dyno) have shown that the gains are small enough with an intake and exhaust on a standard 3.8L to be inconclusive. There is a torque loss down low (under 3,500 RPM), and maybe 1-4 WHP gain up top (over 4,500 RPM). NOT worth the $500+ you'll spend!

As for improved fuel economy, MAYBE 1/4 MPG. Again, NOT worth the $500+.

The ONLY reason to change out the exhaust is to gain clearance. That's why I did mine. As for the intake, only if you're running a snorkel Mark W.
Xinfinite.
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Old 10-31-2010, 09:40 AM   #11
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I still like the "placebo " affect or whatever you want to call it. I only have the exhaust on now . I got mrbp exhaust at the quadratech tent sale for $200 bucks brand new. I like the growl I get from it. Next is the flashpaq
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Old 10-31-2010, 10:28 AM   #12
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Well this has been very interesting. So what would be a "forum approved" way to get some more power into a JK? Particularly without substantially increasing the wear on the engine? Jet chips are snake oil, intake/exhaust switches produce only minimal real results, etc. Regearing perhaps?

In truth, with the manual transmission allowing liberal downshifting, I'm happy with what I have (and perhaps should leave well enough alone). I'm just looking for future options if I feel like giving it a boost.
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Old 10-31-2010, 10:40 AM   #13
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^ Swap in a Hemi, re-gear, or live with the 3.8L. Some have gone the supercharging route, but the fuel/ignition controller is still just a piggyback that occasionally doesn't allow full power for no apparent reason. Not exactly the ideal, in my book- Mark W.
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Old 10-31-2010, 11:58 AM   #14
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Swap in a Hemi? As in completely replace the engine? That undoubtedly generates more power, though that's a pretty aggressive mod to fix what ain't broken. Anyone know somebody who's done this that could throw out a ballpark number for what that would be expected to cost? I wonder if there's any market upon which you can sell your old engine to recoup some of the cost.
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Old 10-31-2010, 12:30 PM   #15
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YUP, you can sell your engine/tranny for a couple thou !!


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Swap in a Hemi? As in completely replace the engine? That undoubtedly generates more power, though that's a pretty aggressive mod to fix what ain't broken. Anyone know somebody who's done this that could throw out a ballpark number for what that would be expected to cost? I wonder if there's any market upon which you can sell your old engine to recoup some of the cost.
AEV will charge you 20K to swap your 3,8L and they'll use Chryslers 5.7/6.1 Hemi and new 5spd auto--new everything-or

Do it yourself for 10/12K--not an easy job, unless you have them doit !!

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Old 10-31-2010, 04:42 PM   #16
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Wow--$20k? That makes a near $50k Wrangler without any other mods at all! My 3.8L is looking better and better, at least for the half decade or so . . . .

Thanks for the input folks, as always.
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Old 11-01-2010, 07:44 AM   #17
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Hey MTH,

Last Monday I Got my 2010 Rubicon, Awesome vehicle, Absolutely love it. The day I knew I was for sure going to get this one I ordered a Banks Ram Air CAI, and a Banks Monster Muffler. I got the two for $640 w/ free shipping From XDP Banks Power Stinger System 3.8L ... Installed myself, the CAI took 20 minutes, the exhaust 2 hours. the two together make my Wrangler so much better, it has a little more power, a little better mpg. The feel that you get when you start it up and drive it is great. In Banks own words; The exhaust note is authoritative, yet civil. It is the quietest straight through muffler that I know of, when you're cruising it is not loud at all, when you want to really give it power it sounds great.
I highly recommend getting the Banks Stinger system!!!
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Old 11-01-2010, 08:42 AM   #18
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^ And again, that's a LOT of money to spend just for a little noise! That's almost a month's worth of payments for both of our JK's! If all you want is a nice sound, the Edelbrock axleback is a solid setup. $189.99, all stainless construction, and high and tight- exits behind the right rear tire. Unlike most exhausts, it won't catch rocks unless you're doing it very wrong Mark W.
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Old 11-01-2010, 01:58 PM   #19
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^ And again, that's a LOT of money to spend just for a little noise! That's almost a month's worth of payments for both of our JK's! If all you want is a nice sound, the Edelbrock axleback is a solid setup. $189.99, all stainless construction, and high and tight- exits behind the right rear tire. Unlike most exhausts, it won't catch rocks unless you're doing it very wrong Mark W.
I looked into the Edelbrock, they don't sell them for the JK anymore. I'm sure with the correct tool and space you can fashion up anything though.
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Old 11-01-2010, 02:01 PM   #20
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Well this has been very interesting. So what would be a "forum approved" way to get some more power into a JK? Particularly without substantially increasing the wear on the engine? Jet chips are snake oil, intake/exhaust switches produce only minimal real results, etc. Regearing perhaps?

In truth, with the manual transmission allowing liberal downshifting, I'm happy with what I have (and perhaps should leave well enough alone). I'm just looking for future options if I feel like giving it a boost.
A Superchips Flaspaq is well worth every cent.
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Old 11-01-2010, 02:10 PM   #21
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^ They sure do, unless their rep is lying
Edelbrock.com - Exhaust - Trucks
Mark W.
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Old 11-01-2010, 02:13 PM   #22
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Well they do show up on the web site but when I called they did not have any in stock anywhere and the salesman said that they were discontinuing them so IDK. Too bad, they are a good deal.
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Old 11-01-2010, 02:21 PM   #23
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^ Hmm... bummer. Check eBay, maybe? I know I'm not giving mine up! Mark W.
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Old 11-01-2010, 02:33 PM   #24
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I've talked to several people about the Superchips Flashpaq and they all said it's not worth the damage it could cause to the engine, they said to leave the stock computer alone... anyone know anything bout that?
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Old 11-01-2010, 02:36 PM   #25
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And about the Banks CAI And Exhaust being pricy I agree, I could have gotten a magna flow for a fraction of the cost but I wanted a straight through exhaust, but not so loud that you could never talk while driving. I'm happy with it.
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Old 11-01-2010, 03:16 PM   #26
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[Deleted--repetitive post.]
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Old 11-01-2010, 03:17 PM   #27
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I've talked to several people about the Superchips Flashpaq and they all said it's not worth the damage it could cause to the engine, they said to leave the stock computer alone... anyone know anything bout that?

That seems to sum up the basic view from a lot of folks: Anything that doesn't work big changes is ineffective (Jet Chips), whereas anything that works big changes is damaging (Flashpaq). Frankly, that makes a good deal of common sense. If a change is simple, harmless, and low cost, the vehicle would probably be designed that way in the first place. I lack the expertise, however, to know if this is truly a good rule of thumb.
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Old 11-01-2010, 03:27 PM   #28
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Anyone try high performance wires? If you can increase the gap to .65 it must run cleaner. Will they work with the superchip flashpaq?
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Old 11-01-2010, 03:36 PM   #29
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A Superchips Flaspaq is well worth every cent.
On an autotrans, that is.

I just did the 91 octane tune from the 87; I'm running Costco 93 octane fuel.
Boy howdy.

mpgs are up, more than compensating the difference in price. No ping at all and it is just so smooth now in the hills.

I'm thinking of road-tripping to Flashpaq to hug somebody.
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Old 11-01-2010, 03:53 PM   #30
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As for damage, the ignition maps are still pretty conservative. As long as you're not a moron, and run the 93 octane map on 86-7 octane, you'll be fine. Towed with mine, and wheeled the piss out of it- no problems.

Also, if something ever DID happen, you can un-flash it, and bring it in with raised palms and the dumb look on your face

As for wires, I have the Granatelli. No real noticable difference except in color. Maybe 0.25 MPG that I can attribute to them, and NO power gain at all. Top end IS noticably smoother, but I can't say anything for power- Mark W.

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