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E51 The E51 Catalytic Converter Problem

Charisma

Newbie
E51 Owner
Scotland
#21
From the vast experience within this group, I would really appreciate your views regarding the "average" life span and reliability of the Cats for the E51, how much do they cost to replace, etc?

I am just about to take receipt of my E51 this Saturday with a mileage of c 45k, MOT passed two weeks ago etc. All of the above has been incredibly insightful but I must admit leaving me in a cold sweat and I would welcome any guidance to ask the dealer on the day. Thanks in advance and all the best.
 

spuddyo

Well-Known Member
Premium Member
E51 Owner
#22
I replied to your CAT thread, but no cost to replace the rear CATs - just remove them for not much money. Most CATS last the lifetime of the car, a small number fail or clog prematurely so its wise to remove them just in case.
 

AlanM

Here for life
Premium Member
E51 Owner
South East
#24
From the vast experience within this group, I would really appreciate your views regarding the "average" life span and reliability of the Cats for the E51, how much do they cost to replace, etc?

I am just about to take receipt of my E51 this Saturday with a mileage of c 45k, MOT passed two weeks ago etc. All of the above has been incredibly insightful but I must admit leaving me in a cold sweat and I would welcome any guidance to ask the dealer on the day. Thanks in advance and all the best.
So you'll maybe buy a dash cam for £100 in case of an accident, or a 1st aid kit in case you need it, or a fire extinguisher in case of fire. So spend 2hrs labour costs at your local garage for a decore and stop sweating;)
 

MrRob_in

Part of the furniture (please de-cat your e51/2)
Premium Member
E51 Expert
E51 Owner
#25
So has anyone noticed better MPG when you remove the cats?
No, because no one in there right mind drives or admits to driving one long enough without removing the rear cores to worry about mpg with them in.

Honestly in same conditions you can drive the same route and get 18 to 28 mpg depending on your right foot, how the heck anyone can say doing X saved 2 mpg without removing all the other variables is beyond my comprehension.
 

DaveC.

Member
Premium Member
E51 Owner
#27
Feeling the love. Thank you both for settling your differences.

Either way, the cats need to be removed/de-cored. Whether or not you inform your insurance is up to you, but it's either that or face a blown engine. I know which I'd rather do!
So does any one know if a set of replacement straight through pipes is available to bolt straight in, I do like an easy life lol !
 

MrRob_in

Part of the furniture (please de-cat your e51/2)
Premium Member
E51 Expert
E51 Owner
#30
Thanks Spencer, I thought a couple of straight through pipes the length of a cat box with a couple of clips each £100 not over £ 230 gulp !
? They gotta make money (or they wouldn’t sell them). That’s why most of us de-core. Cheaper, stealthier.
 

AlanM

Here for life
Premium Member
E51 Owner
South East
#33
Hi @DaveC, You say you like an easy life? Me too which is why with a copy of the picture below, I went to my local garage and asked them to de-core the rear two cats.

de-core-2.jpg


2hrs labour and parting with £108 was simple enough for me.

But if you want to order up some extra kit, wait for it to arrive and phaff around underneath etc., then hey, each to their own;)
 

MrRob_in

Part of the furniture (please de-cat your e51/2)
Premium Member
E51 Expert
E51 Owner
#34
Hi @DaveC, You say you like an easy life? Me too which is why with a copy of the picture below, I went to my local garage and asked them to de-core the rear two cats.

View attachment 1430

2hrs labour and parting with £108 was simple enough for me.

But if you want to order up some extra kit, wait for it to arrive and phaff around underneath etc., then hey, each to their own;)
Perfectly put.
 

stevemen

Here for life
E51 Owner
#35
No, because no one in there right mind drives or admits to driving one long enough without removing the rear cores to worry about mpg with them in.

Honestly in same conditions you can drive the same route and get 18 to 28 mpg depending on your right foot, how the heck anyone can say doing X saved 2 mpg without removing all the other variables is beyond my comprehension.
Elgrands are not about MPG there about feel good factor. If MPG is a concern than maybe a Mirca would of been a better buy.....cheaper parts too!
 
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