bvandyk wrote:

What will the warranty say about a de-cat?

Big no-no!

But if you just take off the cat, drill out the honeycomb material and refit, there is no way LR will know about it. I plan to do just that in a week's time. --
2010 Defender Puma 90 + BAS remap + Alive IC + Slickshift + Ashcroft ATB rear
2015 Range Rover Sport V8 Supercharged



Defender Puma Workshop Manual: https://bit.ly/2zZ1en9
Discovery 4 Workshop Manual: https://bit.ly/2zXrtKO
Range Rover/Sport L320/L322/L494 Workshop Manual: https://bit.ly/2zc58JQ

Naks wrote:

bvandyk wrote:

What will the warranty say about a de-cat?

Big no-no!

But if you just take off the cat, drill out the honeycomb material and refit, there is no way LR will know about it. I plan to do just that in a week's time.

bvandyk wrote:

Don't know why they would not like it if you actually improve the engines reliability. What do they say about center silencer removal?

Well, for starters, if you improve reliability, then it means they can't make money off you. Also, how do they ensure that everyone's mods improves reliability? Simpler to just ban everything.

Centre silencer removal is also a big no-no. But then again if you are friendly with your service manager, sometimes they let these things slip by. --
2010 Defender Puma 90 + BAS remap + Alive IC + Slickshift + Ashcroft ATB rear
2015 Range Rover Sport V8 Supercharged



Defender Puma Workshop Manual: https://bit.ly/2zZ1en9
Discovery 4 Workshop Manual: https://bit.ly/2zXrtKO
Range Rover/Sport L320/L322/L494 Workshop Manual: https://bit.ly/2zc58JQ

BruceT wrote:

I was told that any failure or claim that is repudiated due to a modification is because LR have proven the failure to be due to the modification......

So what failures can occur from removing the catalytic converter?

BruceT wrote:

Yes it is risky and you may need to argue the point but I have not read anything that proves any negative effects on any components because of these mods.

Constantia LR have done some decats as well as intercoolers on their customers vehicles according to Elton and the service manager, so I am sure this could even be used to argue the point. Also remember you are improving efficiency's, you are not modifying to make your Landy faster ..... (i hope)

Another example, I recently did my own brake pads. Now if something goes wrong with my brake calipers they may say it was due to my workmanship. They would have to prove it......but how many complaints have you heard related to brakes that need warranty claims?

Weigh up your risks. In my opinion. Do the intercooler first and leave the decat for later. If you are worried have LR fit the parts. (will cost a bit though)

pannawonica wrote:

With just removing the honeycomb of the cat and refitting will the flow performance be less than a dedicated Decat ?

BruceT wrote:

pannawonica wrote:

With just removing the honeycomb of the cat and refitting will the flow performance be less than a dedicated Decat ?

A few guys have done this in South Africa and have reported better power up hills and cooler interiors. I dont know though.

BruceT wrote:

I never thought about air flow and you have probably hit the nail on the head. There was a difference in intake temps but not a huge difference.

I would definately hazard a guess that the biggest difference is due to the amount of air going into the combustion chamber....i can not see how around 5 deg C can make that much difference.



Ben I think you need to maybe look at cleaning out your intercooler also. (maybe come fetch my standard one and do a swop - I will help you)

bvandyk wrote:

BruceT wrote:

pannawonica wrote:

With just removing the honeycomb of the cat and refitting will the flow performance be less than a dedicated Decat ?

A few guys have done this in South Africa and have reported better power up hills and cooler interiors. I dont know though.

I am considering it.... But read somewhere a guy got a "hollow" sound to the exhaust from doing it.