GolfGTIforum.co.uk

Model specific boards => Golf mk3 => Topic started by: whileoceanasleeps on 20 November 2012, 00:01

Title: anyone done a decat on their mk3?
Post by: whileoceanasleeps on 20 November 2012, 00:01
what differences do you notice? going to do it this month, will get this http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&item=350644632754&fromMakeTrack=true&ssPageName=VIP:watchlink:top:en

it says two lengths though, 510mm and 710mm which one do you need for a 4 door?
Title: Re: anyone done a decat on their mk3?
Post by: tweed on 20 November 2012, 06:26
Depends what golf you got and year.
Does nothing but change the sound. Pops and bangs that's about it on a standard engine.
Title: Re: anyone done a decat on their mk3?
Post by: Wayne on 20 November 2012, 09:29
Not worth the hassle, you will need the cat for the mot and will gain nothing powerwise.
Title: Re: anyone done a decat on their mk3?
Post by: chrisford_vw on 20 November 2012, 10:43
My cat shot its insides out the back, sounds too loud and pops a lot did notice a small improvement but was with a stainless backbox and a mid silencer delete pipe
Title: Re: anyone done a decat on their mk3?
Post by: whileoceanasleeps on 20 November 2012, 12:13
Depends what golf you got and year.
Does nothing but change the sound. Pops and bangs that's about it on a standard engine.

ok what about a 1996 8v agg gti with cone filter and aftermarket backbox?
Title: Re: anyone done a decat on their mk3?
Post by: whileoceanasleeps on 20 November 2012, 12:23
oh and got a chip to fit this week
Title: Re: anyone done a decat on their mk3?
Post by: Len on 20 November 2012, 13:05
See I disagree!
Having spent most of my life driving cars before cat converters were invented and have one car that doesnt have a cat I believe it is most beneficial to remove the cat.

I remember when they came in and either cars engines were upgraded significantly or the power dropped.

Now there are problems, its unlikely you will pass the MOT emmissions test with the decat fitted. The solution will be to keep your cat and swap it before MOT time.

Now as to their effectiveness - no idea really! :grin:
Just putting one on a standard car will probably have little or no effect.
With some mods to increase airflow there should be an improvement.
Title: Re: anyone done a decat on their mk3?
Post by: tweed on 20 November 2012, 15:10
Long decat for you then mate
Title: Re: anyone done a decat on their mk3?
Post by: whileoceanasleeps on 20 November 2012, 17:29
sweet cheers tweed
Title: Re: anyone done a decat on their mk3?
Post by: technics100 on 20 November 2012, 20:35
My brother actually did mine over the weekend, he used a MK2 centre box instead of the cat as he had it lying about, although upon fitting realised it was rotten.  I have to pick up some pipe tomorrow for him to have another go.  On first imprssions I would say the car is smoother, haven't noticed any mpg improvement yet, but will see.  He did my 1.4 TDi A2 and I noticed 5mpg straight away and made it punchier too..

Title: Re: anyone done a decat on their mk3?
Post by: whileoceanasleeps on 20 November 2012, 22:14
see here's the bit i don't understand.. when i look under the car i see the backbox and then two silencers the same shape/size, on on the angle and one on the longer straight bit. i think the cat's the long one but what does the other bit do?
Title: Re: anyone done a decat on their mk3?
Post by: tweed on 20 November 2012, 22:44
It's called a silencer  :grin: guess what that does. I'll give you a hint. Same job as the backbox
Title: Re: anyone done a decat on their mk3?
Post by: whileoceanasleeps on 20 November 2012, 22:50
ah so you're telling me the silencer silences lol, it's all so clear now  :rolleyes:
Title: Re: anyone done a decat on their mk3?
Post by: tweed on 21 November 2012, 06:43
ah so you're telling me the silencer silences lol, it's all so clear now  :rolleyes:

Ask a stupid question get a stupid answer  :rolleyes:
Title: Re: anyone done a decat on their mk3?
Post by: thai-wronghorse on 21 November 2012, 07:18
Dear Tweed, 

Can you please tell me what my steering wheel does?  :embarrassed:
Title: Re: anyone done a decat on their mk3?
Post by: DCmk3 on 21 November 2012, 12:28
It does nothing, remove it, it's unnecessary weight!

(http://farm6.staticflickr.com/5097/5584070412_59d7855268_z.jpg)

Believe me, I have driven like that before, it's something to remember for years.  :grin:
Title: Re: anyone done a decat on their mk3?
Post by: Len on 21 November 2012, 12:55
Long decat for you then mate

Want to try a sports cat first.

Bit of a difference in price though! :grin:
Title: Re: anyone done a decat on their mk3?
Post by: whileoceanasleeps on 21 November 2012, 13:29
Dear Tweed, 

Can you please tell me what my steering wheel does?  :embarrassed:

ok easy now :grin:
Title: Re: anyone done a decat on their mk3?
Post by: tweed on 21 November 2012, 15:13
 :grin: :grin: :grin: :grin: