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CAT removal
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AussiePeterJ
 


Member Since: 29 May 2014
Location: Adelaide
Posts: 16

Australia 2013 Discovery 4 3.0 SDV6 HSE Lux Auto Nara BronzeDiscovery 4
CAT removal

Hi all, I have done some searching and found a few threads on the D3 forum about CAT removal but nothing much on this forum.
It seems de-cat pipes are available for D3, but are they the same for a D4.

Would really like to hear from D4 owners who have lost the cat, pro's, con's - what effect if any on EGT, do the cat's give any trouble, what back pressure do they add to the exhaust system, any solid technical info would be much appreciated.

Thanks

Peter
 MY13 D4 Nara Bronze HSE, Almond Interior, E-Diff, 20" for the road, 18" GOE for the fun stuff, Traxide, OL Bar, GAP IIDTool, Pioneer Tray, DAB+ retro-fit, Vintage SAV Marchal Driving lights (weird I know but what can I say).......more to come  
Post #187243525th Oct 2017 11:48 pm
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Naks
 


Member Since: 12 Jul 2010
Location: Stellenbosch, Republic of the Western Cape
Posts: 506

South Africa 2011 Discovery 4 3.0 SDV6 SE Auto Fuji WhiteDiscovery 4

I had the cat removed on my D4 - the exhaust shop just cut out a section of the metal pipe, drilled out the insides and welded back the opening.

A very noticeable reduction in turbo lag, very little increase in noise, a little more oomph when accelerating in third, especially at low speed.

I cannot comment on EGT, as I did not monitor, but the EGTs in my Puma were considerably reduced when I removed its cat, so it can only be the same on the D4.

do it Thumbs Up
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Post #187244226th Oct 2017 5:16 am
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AussiePeterJ
 


Member Since: 29 May 2014
Location: Adelaide
Posts: 16

Australia 2013 Discovery 4 3.0 SDV6 HSE Lux Auto Nara BronzeDiscovery 4

Thanks Naks, I have been away for a few days so could not check the thread, I guess the overall response supports my earlier observation that CATs are not that much of a concern within the D4 community, but yes I think I will put it on the list and do it anyway.
Peter
 MY13 D4 Nara Bronze HSE, Almond Interior, E-Diff, 20" for the road, 18" GOE for the fun stuff, Traxide, OL Bar, GAP IIDTool, Pioneer Tray, DAB+ retro-fit, Vintage SAV Marchal Driving lights (weird I know but what can I say).......more to come  
Post #187360630th Oct 2017 12:44 am
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LIAMMCL
 


Member Since: 27 Aug 2013
Location: Northumberland
Posts: 196

England 2009 Discovery 4 3.0 TDV6 HSE Auto Nara BronzeDiscovery 4

Have a look at my post 2/3 down this page https://www.disco3.co.uk/forum/topic126959-810.html

The exhaust definitely smells a bit more when ticking over, but as above has freed up the engines breathing a very small amount.
  
Post #187367830th Oct 2017 10:50 am
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nigethecat
 


Member Since: 11 Sep 2016
Location: Aberdeen
Posts: 64

United Kingdom 2007 Discovery 3 TDV6 Base 5 Seat Manual Alaska WhiteDiscovery 3

I removed both cats from my D4 but it didn't make any difference to the performance Rolling with laughter


  
Post #187368830th Oct 2017 11:44 am
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AussiePeterJ
 


Member Since: 29 May 2014
Location: Adelaide
Posts: 16

Australia 2013 Discovery 4 3.0 SDV6 HSE Lux Auto Nara BronzeDiscovery 4

LIAMMCL wrote:
Have a look at my post 2/3 down this page https://www.disco3.co.uk/forum/topic126959-810.html

The exhaust definitely smells a bit more when ticking over, but as above has freed up the engines breathing a very small amount.


Thanks for that, your pipe work looks great. I haven't found the replacement pipes advertised for D4's that are available for D3s so I guess more evidence supporting a low level of interest or concern about leaving them in place but I like your solution.
 MY13 D4 Nara Bronze HSE, Almond Interior, E-Diff, 20" for the road, 18" GOE for the fun stuff, Traxide, OL Bar, GAP IIDTool, Pioneer Tray, DAB+ retro-fit, Vintage SAV Marchal Driving lights (weird I know but what can I say).......more to come  
Post #187369030th Oct 2017 11:57 am
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LIAMMCL
 


Member Since: 27 Aug 2013
Location: Northumberland
Posts: 196

England 2009 Discovery 4 3.0 TDV6 HSE Auto Nara BronzeDiscovery 4

The part is listed as a DPF removal pipe - cheap on eBay - I advise ordering a new clamp for the forward end and new gasket for the rearward end. There are a lot of bosses/fittings on the new part for the cooling pipework of the DPF which I blanked off then it bolted straight up.
  
Post #187373230th Oct 2017 1:47 pm
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