Matt L
Member
Registered: 17th Apr 06
User status: Offline
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just read on another site that diesels dont need cats to be road legal or pass mot's
why is that?
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ed
Member
Registered: 10th Sep 03
User status: Offline
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They have a diesel particulate filter.
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ed
Member
Registered: 10th Sep 03
User status: Offline
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Although I thought you were supposed to have a cat too... Not sure actually.
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Linch
Member
Registered: 4th May 06
Location: Whickham, Tyne and Wear
User status: Offline
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some use a cat, later cars (generally 2007 on) use a particle filter.
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dannymccann
Member
Registered: 9th Aug 06
Location: Doddington, Lincolnshire
User status: Offline
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Isnt it because they arent tested on emissions but smog? I dont know, will find out at MOT time
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Superlite Ltd.
Member
Registered: 9th Jan 07
User status: Offline
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quote: Originally posted by dannymccann
Isnt it because they arent tested on emissions but smog? I dont know, will find out at MOT time
yes
Diesel engine don't need a cat because they only do a smoke test for MOT
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Superlite Ltd.
Member
Registered: 9th Jan 07
User status: Offline
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quote: Originally posted by ed
They have a diesel particulate filter.
only new ones do, mine has fuck all
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Matt L
Member
Registered: 17th Apr 06
User status: Offline
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so i can take my cat out and it will still pass an mot??
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Superlite Ltd.
Member
Registered: 9th Jan 07
User status: Offline
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yes
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ed
Member
Registered: 10th Sep 03
User status: Offline
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One thing I was wondering. How come they don't put centre boxes on diesels? Mine isn't loud, but it's not really that quiet either. Plus it doesn't sound that good really
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pow
Premium Member
Registered: 11th Sep 06
Location: Hazlemere, Buckinghamshire
User status: Offline
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quote: Originally posted by ed
One thing I was wondering. How come they don't put centre boxes on diesels? Mine isn't loud, but it's not really that quiet either. Plus it doesn't sound that good really
Yeah, my Clio and Ibiza don't have cnetre boxes
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Dave A
USER UNDER INVESTIGATION - DO NOT TRADE
Registered: 10th Dec 03
Location: County Durham
User status: Offline
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TD engines dont have centre silencers due to them being very quiet engines, the turbo itself silences most of the noise.
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dannymccann
Member
Registered: 9th Aug 06
Location: Doddington, Lincolnshire
User status: Offline
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Dave, does removing the cat (decat??) provide any sort of performance differences?
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Robin
Premium Member
Registered: 7th Jan 04
Location: Northants Drives: Clio 182 Cup
User status: Offline
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quote: Originally posted by Dave A
TD engines dont have centre silencers due to them being very quiet engines, the turbo itself silences most of the noise.
I thought that too, I had my fingers crossed with the Fiesta and I was massively, massively wrong 
Diesel engines are inherently quieter too, which helps.
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