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 Post subject: CRD Muffler Delete Review
PostPosted: Wed Jan 28, 2015 11:53 am 
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Joined: Fri Jan 23, 2015 10:19 pm
Posts: 23
Location: San Pedro, CA
20 minute job for $50. Replaces OEM muffler with 2.5" pipe.

Improvements:
-Exhaust brake effect much reduced. Coasts more like a gasser.
-Turbo spools quicker, thus acceleration is increased
-Has a mean idle
-Deep growl 1/2-full throttle
-Weight savings
-Ground clearance
-Should net increased fuel mileage
-Subdued sound with windows up

Negative:
-Could be quieter above 70mph

Highly recommended mod due to the cost/benefit ratio. Don't even mess around with swapping mufflers.

Hope this helps someone out.

_________________
2005 KJ CRD
Frankenlift + plate
31x10.5x15 Duratracs
15x7 Black Rock Jack 929 w/ 4.5" BS
Powerstop drilled/slotted rotors/ pads
Wells/ bumper cut. Pinch welds. DIY bed liner'd Crossbars and grill. 8,000lb hitch. Tint. Debadge. Thule. Kenwood DDX470
Muffler delete. ORM

Weekend: 2008 135i. 400rwhp/ 450rwtq. 3,100lbs


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 Post subject: Re: CRD Muffler Delete Review
PostPosted: Wed Jan 28, 2015 3:25 pm 
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Joined: Sat Nov 23, 2013 8:57 pm
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Location: Boise, Idaho
Thanks for the post! This has been on my to do list, but I've been worried about the noise. So you're saying that it is noticeable at 70+ mph?

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05 CRD: H.D.S2 stat, Ironrock trilink, Integrated air OX rear,truetrac front, Suncoast,OME 2.5, JBA UCA,rock rails, Moabs&245/75 Duratracs, GDE tunes ,FFD fan,ARP's, 2 micron fuel, new head,rockers, cams,sasquatch battery tray & grid heater, welded EGR port & trans drain, muffler delete,tensioner relocated
Mech fan VH & AC delete


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 Post subject: Re: CRD Muffler Delete Review
PostPosted: Wed Jan 28, 2015 10:20 pm 
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Joined: Fri Jan 23, 2015 10:19 pm
Posts: 23
Location: San Pedro, CA
I'm on stock size tires and 72mph is where the sound kicks in. Just standard exhaust pulses. Zero drone. I repeat zero drone. It's not bad especially since our CRD's are inherently loud as is.

When I deleted the muffler on my twin turbo'd bimmer THAT was loud.

I'd say do it. Must do mod for a CRD. love how it coasts now.

_________________
2005 KJ CRD
Frankenlift + plate
31x10.5x15 Duratracs
15x7 Black Rock Jack 929 w/ 4.5" BS
Powerstop drilled/slotted rotors/ pads
Wells/ bumper cut. Pinch welds. DIY bed liner'd Crossbars and grill. 8,000lb hitch. Tint. Debadge. Thule. Kenwood DDX470
Muffler delete. ORM

Weekend: 2008 135i. 400rwhp/ 450rwtq. 3,100lbs


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 Post subject: Re: CRD Muffler Delete Review
PostPosted: Wed Jan 28, 2015 10:45 pm 
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Joined: Sat Nov 23, 2013 8:57 pm
Posts: 2128
Location: Boise, Idaho
Awesome :rockon: I'm all over this mod. Maybe I'll crawl under there tomorrow and cut it out.

thanks again! :JEEPIN:

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05 CRD: H.D.S2 stat, Ironrock trilink, Integrated air OX rear,truetrac front, Suncoast,OME 2.5, JBA UCA,rock rails, Moabs&245/75 Duratracs, GDE tunes ,FFD fan,ARP's, 2 micron fuel, new head,rockers, cams,sasquatch battery tray & grid heater, welded EGR port & trans drain, muffler delete,tensioner relocated
Mech fan VH & AC delete


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 Post subject: Re: CRD Muffler Delete Review
PostPosted: Fri Apr 03, 2015 1:03 am 
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Joined: Fri Jan 23, 2015 10:19 pm
Posts: 23
Location: San Pedro, CA
You do it yet?

_________________
2005 KJ CRD
Frankenlift + plate
31x10.5x15 Duratracs
15x7 Black Rock Jack 929 w/ 4.5" BS
Powerstop drilled/slotted rotors/ pads
Wells/ bumper cut. Pinch welds. DIY bed liner'd Crossbars and grill. 8,000lb hitch. Tint. Debadge. Thule. Kenwood DDX470
Muffler delete. ORM

Weekend: 2008 135i. 400rwhp/ 450rwtq. 3,100lbs


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 Post subject: Re: CRD Muffler Delete Review
PostPosted: Fri May 22, 2015 4:27 am 
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Joined: Sat Jan 21, 2012 7:49 pm
Posts: 51
Location: Omaha, Nebraska
I've had this done for a few years now. Probably one of the first things I did to my CRD. I'd recommend it for everyone.

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05 Liberty CRD - Sold
07 WK CRD - Family SUV


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 Post subject: Re: CRD Muffler Delete Review
PostPosted: Fri May 22, 2015 6:45 am 
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Joined: Sat Aug 24, 2013 11:36 pm
Posts: 4198
Location: Central GA
Tried this on mine when I removed the CAT and the choke point; a little too much noise to suit me, so I installed a 2.5" in/out Flowmaster and it is perfect!!! High flow and little noise at highway cruising speeds.... 8)

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05 Jeep Liberty CRD Limited :JEEPIN:
Blk Brush Guard/Hella's/LED's
Ironman Springs/Bilstein's
Yeti Stg4 MaxTune
Weeks ElbowKit/BatteryTray
NO FCV/EGR
Samcos/ProVent
SunCoast/Transgo
Carter Intank-pump
2mic.Sec.Fuel Filter
Flowmaster/NOcat
V6 Airbox
GM11 blade fan/NAPA HDclutch
Ironrock Trilink
98 Dodge Cummins, 5"exh. Viair, Huge K&N


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 Post subject: Re: CRD Muffler Delete Review
PostPosted: Sat May 23, 2015 1:21 pm 
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Joined: Mon Jul 30, 2012 3:29 pm
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Location: Minnesota
Here is a video (not mine) of the sound comparison between stock and muffler delete: https://www.youtube.com/watch?v=xlOBuliKo_M

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 Post subject: Re: CRD Muffler Delete Review
PostPosted: Wed Oct 21, 2015 9:46 pm 
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Joined: Tue Jun 04, 2013 1:21 pm
Posts: 2035
Location: Utah
I have had mine done for a year and a half or so and it is louder at highway speeds. When it was first done i had to look under the car to make sure they had actually removed it because it sounded almost the same at idle.

The whole time its been my wifes daily driver and I havent heard a peep. Its not any louder than her 09 legacy was at highway speed I dont think.

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2006 CRD - GTB2056 turbo by Dieselguy86, Eco Trans Tune, Lift Pump, Week's, HDS Tstat, Racor Filter, ARP's, OME 790's+Top Plate, JBA 2.5", JBA UCA, Moab's+265/75R16, ARB Bar

2014 F150 EcoBoost - Gearhead Tuned, AFE CAC, Bilstein 5100's, Airlift Bags, Duratracs


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 Post subject: Re: CRD Muffler Delete Review
PostPosted: Thu Oct 22, 2015 10:59 am 
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Joined: Fri Jun 22, 2007 11:43 am
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Location: Green Cove Springs FL
Just don't do what I did and cut it off at where the cat used to be.
It now dumps right under the passenger seat.
It's stupid loud when accelerating but not bad at cruising speed.
Keeping the windows rolled up helps abate the sound a bit.

Image

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Bought my '05 CRD on June 2nd '07, used with 29,000 miles.
intake elbow and EGR delete. 5 volt bosch glow plugs
Yeti stage 2 ECU tune. Straight pipe exhaust. DIY intercooler hoses
Provent and modified factory 180F thermostat
Replaced cylinder head (cracked) at 160,000 miles + ARP studs
2.5 inch lift, JBA upper arms, 235-85-16 tires.
Still love it.


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 Post subject: Re: CRD Muffler Delete Review
PostPosted: Fri May 13, 2016 12:12 am 
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Joined: Sat Nov 23, 2013 8:57 pm
Posts: 2128
Location: Boise, Idaho
I finally cut out the big magnaflow, and I can't tell the difference. Maybe strait pipe is louder than stock, but is sounds the same as magnaflow up to at least 70mph. I think I might hear a slight increase in sound when I floor it, but nothing major. Sure makes the big mufflers obsolete. I kept the cat though, and it does a good job of keeping it quiet.

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05 CRD: H.D.S2 stat, Ironrock trilink, Integrated air OX rear,truetrac front, Suncoast,OME 2.5, JBA UCA,rock rails, Moabs&245/75 Duratracs, GDE tunes ,FFD fan,ARP's, 2 micron fuel, new head,rockers, cams,sasquatch battery tray & grid heater, welded EGR port & trans drain, muffler delete,tensioner relocated
Mech fan VH & AC delete


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 Post subject: Re: CRD Muffler Delete Review
PostPosted: Fri May 13, 2016 9:50 am 
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Location: Central GA
Mountainman wrote:
I finally cut out the big magnaflow, and I can't tell the difference. Maybe strait pipe is louder than stock, but is sounds the same as magnaflow up to at least 70mph. I think I might hear a slight increase in sound when I floor it, but nothing major. Sure makes the big mufflers obsolete. I kept the cat though, and it does a good job of keeping it quiet.

The CAT acts as a muffler and is also a big restriction to the gas flow... Take it out along with the choke point and you will see a big difference in performance and sound.
It will allow the turbo to spool up faster not having any backpressure on it and will increase power a little along with better fuel economy if you can keep your foot out of it... :wink:
Removing the CAT will not set any DTC's since the CRD has no O2 sensors.... :D

_________________
05 Jeep Liberty CRD Limited :JEEPIN:
Blk Brush Guard/Hella's/LED's
Ironman Springs/Bilstein's
Yeti Stg4 MaxTune
Weeks ElbowKit/BatteryTray
NO FCV/EGR
Samcos/ProVent
SunCoast/Transgo
Carter Intank-pump
2mic.Sec.Fuel Filter
Flowmaster/NOcat
V6 Airbox
GM11 blade fan/NAPA HDclutch
Ironrock Trilink
98 Dodge Cummins, 5"exh. Viair, Huge K&N


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 Post subject: Re: CRD Muffler Delete Review
PostPosted: Fri May 13, 2016 11:42 am 
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Location: Boise, Idaho
On the cat front, one of my sons and myself are severe asthmatics, so a diesel without a cat is like an instant asthma attack. I have to be really careful with all diesel exhaust anyhow, but the cat free ones make me chronically ill. I got the egr port welded just to make sure no exhaust makes it in the cab. Maybe I should upgrade to a bigger cat with much less restriction, but then it would be really loud and I'd want to to put a muffler back on it :lol:
I do appreciate the advice though, I can dream about the extra power. You know, I had one CRD that the PO had removed the CAT, and it was surprisingly perky.

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05 CRD: H.D.S2 stat, Ironrock trilink, Integrated air OX rear,truetrac front, Suncoast,OME 2.5, JBA UCA,rock rails, Moabs&245/75 Duratracs, GDE tunes ,FFD fan,ARP's, 2 micron fuel, new head,rockers, cams,sasquatch battery tray & grid heater, welded EGR port & trans drain, muffler delete,tensioner relocated
Mech fan VH & AC delete


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 Post subject: Re: CRD Muffler Delete Review
PostPosted: Fri Jul 20, 2018 7:06 pm 
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Joined: Mon Jun 11, 2018 7:38 am
Posts: 30
Before attempting this you need to realise that there are legal limits set on exhaust noise levels in most countries in the world, so removing the muffler can therefore make the vehicle illegal to use on the road!
And removing the CAT is a sure way to make sure it fails emission tests, like the ones carried out during the MOT here in the UK.
And as for "perkyness"...my 2005 KJ 2.8 CRD Sport (161hp, 296 lbs-ft of torque) is extremely quick off the mark, even with a Cat and muffler on the stock exhaust pipe...I can burn off virtually anything at the traffic lights in first gear!
But then, it does have a six speed manual gearbox, not a heavier, slower and much more inefficient Auto box.
And I don't know why anyone would want to make their KJ noisier anyway, as I really like the quietness of my KJ, especially at motorways speeds (over 60mph). In top gear at 70mph, my KJ cruises quietly at 2450rpm, so I can easily hear the radio without having to crank up the volume to ear splitting levels, and there is virtually no wind noise, which really helps too.
Also I seriously doubt removing the muffler will reduce fuel consumption...If anything, fuel consumption might go up as the engine "MAP" tuning in the ECU is programmed to work best with the CAT and muffler in line.
If I put my foot down, and use the aircon all the time, my mpg never drops below 31mpg...Drive it like a granny, and with the aircon switched off, and I easily average 38mpg (Which is 45mpg in UK gallons!), so I am very happy having a quieter KJ with a stock exhaust fitted. :wink:


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 Post subject: Re: CRD Muffler Delete Review
PostPosted: Sat Jul 21, 2018 11:57 am 
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Joined: Sat Aug 24, 2013 11:36 pm
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Location: Central GA
jeepsterkj wrote:
And I don't know why anyone would want to make their KJ noisier anyway, as I really like the quietness of my KJ, especially at motorways speeds (over 60mph). :wink:

Cannot speak as to db levels in other countries, but here in the US totally removing the CAT and even the muffler would not make the Jeep CRD loud enough to warrant any attention by law enforcement. (turbo acts as a sound reducer anyway) There are plenty of other vehicles on the road including many big trucks that make several times the db noise of our little 4 bangers.
But to kind of make a point, it is not about wanting to make the little diesel noisier, far from it, it's all about engine performance and removing anything behind the turbo to reduce any backpressure that can help improve turbo response, performance, and lower EGT's.

Remember the diesel engine is a simple air pump with a little fuel added to get work out of it. Doing anything to improve total air flow volume into the engine and expel spent gases out of the engine faster with the least resistance will help improve performance, turbo response, fuel milage, and add to engine longevity.
Many, including myself, are not proponents of totally removing the muffler, but rather changing it out for a free flowing unit and keeping the tailpipe.
With no CAT and a free flowing muffler and tailpipe out the rear, there can be heard no exhaust noise whatsoever going down the road at cruising speeds.

The CAT and the choke point in front of it should be totally removed, unless you are in an area where visual or exhaust inspections would prevent that, due to the fact the CAT is the most restrictive part of the exhaust system and certainly does increase backpressure on the turbo and thus raise operating EGT's and lowers overall performance...
Since removing the CAT does not set any DTC's on the Jeep CRD and if your area inspections does not include tailpipe sample "sniffing", the CAT can be totally removed or at a minimum removed, gutted, and then reinstalled. :roll:

:SOMBRERO:

_________________
05 Jeep Liberty CRD Limited :JEEPIN:
Blk Brush Guard/Hella's/LED's
Ironman Springs/Bilstein's
Yeti Stg4 MaxTune
Weeks ElbowKit/BatteryTray
NO FCV/EGR
Samcos/ProVent
SunCoast/Transgo
Carter Intank-pump
2mic.Sec.Fuel Filter
Flowmaster/NOcat
V6 Airbox
GM11 blade fan/NAPA HDclutch
Ironrock Trilink
98 Dodge Cummins, 5"exh. Viair, Huge K&N


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