De-cat or not to De-cat

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redhotmax

Member

Posts

53

Location

Abingdon - centre of the universe

• Jul 15, 2009

• #1

Disco 300 tdi 1996.

Some suppliers are now selling exhaust front pipes without catalytic converters. Are these road legal or are they only for off road use ?

I have to re-new my exhaust front down pipe soon, am I correct in thinking that if I replace it with a through tube (pipe without cat) it will not pass the next MOT as it built with a cat originally

regards
Red

 

James_300tdi

New Member

Posts

139

Location

Winton, Dorset

• Jul 15, 2009

• #2

on a diesel you dont have a cat it acts more as a filter., with a straight through pipe the emmisions will be more or less the same.

 

robint

Well-Known Member

Posts

7,057

Location

werz te cyder applez do grow zomerzet

• Jul 15, 2009

• #3

its not a real cat converter the proper name is a partucilar filter or somefing like that !!if its old its proberly not doing its job right anyway, so change the fing to a straight through pipe wont make any difference and no problems with the mot either !!

 

karlo

New Member

Posts

84

Location

Swadlincote, South Derbyshire

• Jul 15, 2009

• #4

Do it, mine is done and been through MOT like it!

 

minidod

Active Member

Posts

421

Location

Scottish Borders

• Jul 15, 2009

• #5

Do it!

Brother-in-law has a N plate 300tdi and doesn't have a box on the exhaust and it still passed an MOT it sounds like a tractor.

 

B

Beast o Bodmin

Banned

Posts

17,157

Location

never did like the welsh.....tom jones is also cra

• Jul 15, 2009

• #6

wont make no odds on emissions......

 

thebiglad

Well-Known Member

Posts

7,387

Location

Central France

• Jul 15, 2009

• #7

redhotmax said:

Disco 300 tdi 1996.

Some suppliers are now selling exhaust front pipes without catalytic converters.

1. Are these road legal or are they only for off road use ?

2. I have to re-new my exhaust front down pipe soon, am I correct in thinking that if I replace it with a through tube (pipe without cat) it will not pass the next MOT as it built with a cat originally

regards
Red

Click to expand...

Hi Red:

1. De-catted downpipes are perfectly road legal;

2. If you fit one it will NOT adversely affect your mot - it might even improve the emissions test as it will allow the motor to breath better. The UK mot is only a smoke test and vehicles DO NOT need to be fitted with a "cat".

It's one of the best cheap (£21.25+vat from Paddocks) mods you can do to a TDi 300. It will improve responsiveness and mpg.