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Author Topic: Diesel Pre-Cat  (Read 1928 times)

Offline D_Philli_82

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Diesel Pre-Cat
« on: February 11, 2015, 01:33:30 pm »
Hi,

Fancy trying to do a pre cat delete...I've seen the DIY link on this site but want to check are the bolts/gasket that should be replaced the same for tsi, tdi, gti etc..??

Does removing this give the high howl sound or is it the main cat removal that does this..? Want a touch more grunt etc but not a ridiculous howl..a small bit is fine  :smiley:

Cheers
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MK5 1.9TDI 150Bhp

Offline xjay1337

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Re: Diesel Pre-Cat
« Reply #1 on: February 11, 2015, 01:38:44 pm »
No pre cat on a TDI.


The choo noise is the rear section (cat back) if you remove the cat then you won't get the annoying choo anymore which is a good thing.
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Offline D_Philli_82

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Re: Diesel Pre-Cat
« Reply #2 on: February 11, 2015, 03:27:33 pm »
Quote from: xjay1337 on February 11, 2015, 01:38:44 pm
No pre cat on a TDI.


The choo noise is the rear section (cat back) if you remove the cat then you won't get the annoying choo anymore which is a good thing.

Marvellous  :congrats:
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Offline xjay1337

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Re: Diesel Pre-Cat
« Reply #3 on: February 11, 2015, 03:38:34 pm »
basically.

Decat = no choo noise
Stock cat with no silencers = choo
Decat and no silencers = no choo noise

 :happy2: :happy2:
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Offline D_Philli_82

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Re: Diesel Pre-Cat
« Reply #4 on: February 11, 2015, 07:38:02 pm »
Quote from: xjay1337 on February 11, 2015, 03:38:34 pm
basically.

Decat = no choo noise
Stock cat with no silencers = choo
Decat and no silencers = no choo noise

 :happy2: :happy2:

Ahh....but a decat is a mot fail right...so a sports cat is needed instead..?!
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Offline xjay1337

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Re: Diesel Pre-Cat
« Reply #5 on: February 11, 2015, 11:31:02 pm »
Technically yes.
In reality, no.
No sports cats available for a diesel.
as you arent measured on emissions you have no need.
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Offline D_Philli_82

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Re: Diesel Pre-Cat
« Reply #6 on: September 10, 2015, 06:24:37 pm »
Revisiting this...I enquired about getting a decat but the company I went to said they don't offer them as its a MOT fail... @xjay1337 do u have a decat and if so where from and who's your MOT tester..?!  :wink:
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Offline jason_rmh

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Re: Diesel Pre-Cat
« Reply #7 on: September 10, 2015, 06:34:17 pm »
I have a miltek decat on my bkd and passed mot.
I guess it depends on tester, even though the rules should be clear.
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Offline xjay1337

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Re: Diesel Pre-Cat
« Reply #8 on: September 11, 2015, 12:06:38 pm »
Quote from: D_Philli_82 on September 10, 2015, 06:24:37 pm
Revisiting this...I enquired about getting a decat but the company I went to said they don't offer them as its a MOT fail... @xjay1337 do u have a decat and if so where from and who's your MOT tester..?!  :wink:

You'll be fine if you are friendly with a garage.
I have a massive 3 inch downpipe and passed MOT fine..  :notworthy:
I use a garage in Newbury for my MOT's
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Offline D_Philli_82

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Re: Diesel Pre-Cat
« Reply #9 on: September 12, 2015, 08:55:44 am »
Lol silly ques I guess...I guess the fact the place in question make custom exhausts and are an mot tester their hands were tied...and they tried to upsell me a £500 cat back...do these cat backs make any difference to performance at all?? I assume not as it'll still flow air into the cat where the restriction lies!

I just want some custom tips welded onto my existing box and a de cat...more than enough for me.
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Offline xjay1337

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Re: Diesel Pre-Cat
« Reply #10 on: September 14, 2015, 10:56:43 am »
Nope.
Not really much performance gain from Stage 1.
As long as it's mandrel bent it'll be fine
I had a piper exhaust on my 1.9
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