Member Since: 08 May 2016
Location: Essex
Posts: 422
V8 de cat
Good morning I am thinking of having the cats removed on my discovery. Has anyone done this on there v8 and is there any benefits to performance or sound Cheers Steve
Member Since: 28 May 2014
Location: Belfast
Posts: 497
If the CATs are missing when going through the MOT, it'll fail for not having them.
I have heard, but can't confirm, of some simply taking the matrix out of them (by breaking them up) and just having the empty boxes in place. However, not sure how they'd perform re, emissions.
17th Jun 2020 1:29 pm
lynalldiscovery
Member Since: 22 Dec 2009
Location: Maidstone
Posts: 7274
You can get sport and hi flow cats, wont be cheap though!
17th Jun 2020 1:34 pm
Bungle
Member Since: 07 Apr 2015
Location: Wanborough
Posts: 256
Alphamale wrote:
If the CATs are missing when going through the MOT, it'll fail for not having them.
I have heard, but can't confirm, of some simply taking the matrix out of them (by breaking them up) and just having the empty boxes in place. However, not sure how they'd perform re, emissions.
Given it has upstream and downstream O2 sensors I would have thought gutting the cats would have triggered an engine management light unless you fool it somehow. To be honest I am really not sure you would gain much from doing it anyway.
18th Jun 2020 9:38 am
Discoveringcomfort
Member Since: 16 Sep 2015
Location: Berkshire
Posts: 637
It won't end up as SVR performance so removing a centre box is more use isn't it?Series 1 V8
Series 2 Hibrid V8
Discovery 3 HSE V8
18th Jun 2020 11:54 am
lynalldiscovery
Member Since: 22 Dec 2009
Location: Maidstone
Posts: 7274
Bungle wrote:
Alphamale wrote:
If the CATs are missing when going through the MOT, it'll fail for not having them.
I have heard, but can't confirm, of some simply taking the matrix out of them (by breaking them up) and just having the empty boxes in place. However, not sure how they'd perform re, emissions.
Given it has upstream and downstream O2 sensors I would have thought gutting the cats would have triggered an engine management light unless you fool it somehow. To be honest I am really not sure you would gain much from doing it anyway.
I beleive what they do is add an extension piece to the sensor hole so locating the sensor further away from the gas stream, so it sees less gas and assumes it is still clean enough?
18th Jun 2020 1:00 pm
MorganD379
Member Since: 29 Sep 2016
Location: SA62 3PP
Posts: 425
Beware of sports cats...
Before all this tosh about changing the exhaust system upsetting the MOT, I did have a wrx impreza where I took out all the cats replacing with a single sports cat.
It will pass but needs to be hot to get the best out of them
Optional rag was required as I had a 5" exit
18th Jun 2020 3:20 pm
plocker
Member Since: 14 Mar 2016
Location: Preston
Posts: 828
Just remove your centre box (restonator) like I have. No issues with MOT and sounds loads better
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