How to remove/decat your Audi A4/A6 V6 2.5 TDI

In this video I will show you how to remove the precat on your 2.5 TDI A4 or A6 and should you wish how to convert a cat to a decat.
Note - please check your emissions rules/regulations in your location before carrying this out.
Decating can help turbo spool and few up a few BHP which is ideal for track use.
Music:
Cut and Dry - Electronic Hard by Kevin MacLeod is licensed under a Creative Commons Attribution license (creativecommons.org/licenses/...)
Source: incompetech.com/music/royalty-...
Artist: incompetech.com/
Funky Junky by Audionautix is licensed under a Creative Commons Attribution license (creativecommons.org/licenses/...)
Artist: audionautix.com/
Get A Move On by Audionautix is licensed under a Creative Commons Attribution license (creativecommons.org/licenses/...)
Artist: audionautix.com/

[@karlrichardson4665]

Starting an engine and revving the shit out of it straight away, nice one.....

[@ToCoolToBeOld]

If you take the turbo off & shorten the studs where it mounts to the cat then if you have to remove it again it will be easier. The studs only need to protrude a small amount after they're tightened.

[@Vyxxx.-]

Any reason why to decat is it a must do thing

[@genesisalexander2225]

“You can reuse the gasket:
Revs the bollocks out of the car and the gasket goes flying! 😳

[@ivanthebig]

And is there no problem when testing the car then for particles?

[@joepartington9639]

How long did it take on total to do it?

[@tommyduris3044]

Hi mate, Where is the Egr? It seems you have taken it out before you removed the Cat? How did you do that? I'm trying to take it out but there are 2 bolts from the bottom up that I cant seem to get to due to limited room. Cheers

[@ivanthebig]

So removing this gives actualy more power and better noise? My turbo seems to be a bit tired, what is the best turbo for exchange or should i just change the thin metal parts and regain power from the turbo?

[@rockmahina]

😊q

[@diogovieira3362]

Hey yhere, nice A4, I'm planning to do the same to my 2.0tdi, what kind of changes should I expect to performance and sound?

[@styx7989]

2.0tdi you can't because if you make it you will have a check engine light

[@diogovieira3362]

@@styx7989 huh, well I did and its completely fine :b

[@eriklapinskij7420]

@@diogovieira3362 there is some diference with power ?

[@diogovieira3362]

@@eriklapinskij7420 not really, didn't really feel anything noticeable, not even noise. Might have had actual differences if it got a tune, but not only did I not give it such a thing, also sold it almost a year ago

[@BigGroupHug]

Putting a big cavity in the exhaust system adds turbulence and reduces flow efficiency.
Better to cut the CAT apart and weld in a equal diameter pipe or install a new downpipe, then you can swap the CAT back in for MOT inspections.

[@VincentROMY]

Bonjour avant de démonter quel était le problème?

[@CarRestorations5150]

And better yet how did you get two hands in there? Man I’ve been at it for a while now and can’t crack the bottom 3 cat bolts. There on there real good. Barely get one hand at a time in there, not sure how to get the other one in, no room anywhere to squeeze it in

[@grimsbycleethorpesdashcam]

4:12 Gasket YEEEEEEEEEEEEEEEEEEEEET

[@rokzamljen301]

Do you have complete straitgh pipe or just decatt?

[@CarAndMechanical]

Just with the video example it's a decat on the first.

[@tutorials-gamesyt4024]

thx

[@daguitodieguez9885]

Mi coche arranca por la mañana bien y cuando lleva un rato de trabajo lo apagas y no arranca hay que empujarlo

[@glovercarvalho1930]

Does it smell without the pre-cat ?

[@Fosgen]

I use straight pipes on diesel for over 2 decades now. Only thing I dislike about them is strong smell of unburnt hot fuel. You can get used to it. But yeah, it smells.

[@lellocarboni9024]

why did you empty it? did you have problems?

[@CarAndMechanical]

No issues just tuning related

[@lellocarboni9024]

@@CarAndMechanical mine does not push down, could this be the problem?

[@40rdie]

Did removing the cat throw a check engine light

[@CarAndMechanical]

2.5 V6 TDI's like mine don't have sensors in the exhaust.

[@s1n0409]

@@CarAndMechanical Can you tell us yours B6's model year? and 3 letters of engine name? is it AKE?

[@CarAndMechanical]

It's a 2003 AKE

[@s1n0409]

​@@CarAndMechanical Thanks! and maybe you know any internet shop who sells this custom pipe for a4 b6 2.5tdi? Because hitting this stuff out is not for me,I want this part look more sporty than it its now

[@lazyboy100183]

Did decatting make any noticeable difference to performance?

[@carlover9764]

christopher collins it makes more power and more exhaust trubo noise.

[@bobtailvw22]

You didnt know how much cat material is worth did you? all those precious metals tut tut tut

[@s3bby513]

With diesels they not that worth much depends on year and engine

[@antoniociampo7698]

Ok... ECO 10....!!!!

[@styx7989]

fuck ECO !