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Author Topic: Milltek Decat Downpipe or Milltek Hi Flo Sports Cat  (Read 14175 times)

Offline Edition_30_P

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Milltek Decat Downpipe or Milltek Hi Flo Sports Cat
« on: March 13, 2011, 06:48:11 pm »
I'm stuck with whether I should stick with the decat Downpipe or get a hi flow sports cat? I've been doing some research and I've heard there isn't any benefits of a decat just hassle when it comes to MOT time?

Can anyone help me as I'm gonna pull my finger out and by next weekend have either one on my car!

Cheers,

Phil
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Offline bacillus

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Re: Milltek Decat Downpipe or Milltek Hi Flo Sports Cat
« Reply #1 on: March 13, 2011, 07:02:14 pm »
In all likelyhood a decat would fail the MOT.
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Offline Edition_30_P

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Re: Milltek Decat Downpipe or Milltek Hi Flo Sports Cat
« Reply #2 on: March 13, 2011, 07:05:52 pm »
They mainly fail on cold start.... If warm they'll more than likely pass! Main thing I want to know is which would offer better performance and why?
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Offline PDT

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Re: Milltek Decat Downpipe or Milltek Hi Flo Sports Cat
« Reply #3 on: March 13, 2011, 07:11:32 pm »
A decat WILL fail the MOT, but they do offer a performance advantage over a high-flow 'sports' cat. On stage2+ on a K04 based car we typically see 350-360hp but with a decat we have seen 370+. Logs show lower EGT's and the mapping usually allows a richer AFR with a few degrees more timing advance under full load.

However, I am yet to carry out a back to back test with both items on the same car.
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Offline RedRobin

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Re: Milltek Decat Downpipe or Milltek Hi Flo Sports Cat
« Reply #4 on: March 13, 2011, 07:13:56 pm »
Quote from: bacillus on March 13, 2011, 07:02:14 pm

In all likelyhood a decat would fail the MOT.


....Most definitely: De-catting a car in the UK registered after 1993 is illegal as it will fail an emissions check.

Milltek offer a High-flow downpipe, not a de-cat (for legal road use).
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Offline Edition_30_P

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Re: Milltek Decat Downpipe or Milltek Hi Flo Sports Cat
« Reply #5 on: March 13, 2011, 07:47:13 pm »
@PDT: thanks for that! I had PM'd you yesterday too!

@ Robin: Milltek do offer a decat system but, they obviously don't advertise it as they do with the hi flow sports cat!
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Offline RedRobin

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Re: Milltek Decat Downpipe or Milltek Hi Flo Sports Cat
« Reply #6 on: March 13, 2011, 08:59:40 pm »
Quote from: Edition_30_P on March 13, 2011, 07:47:13 pm

@ Robin: Milltek do offer a decat system but, they obviously don't advertise it as they do with the hi flow sports cat!


....I don't know for certain without asking them but think they probably do for competitive race cars only. I think they have more than one cell value available.
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Offline Edition_30_P

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Re: Milltek Decat Downpipe or Milltek Hi Flo Sports Cat
« Reply #7 on: March 13, 2011, 09:06:21 pm »
I know a few guys running them on their S3's, TTRS's and Edition 30's! Just haven't seen them in action. Ompared to ones that are running hi flow sports cats! I've spoken to milltek with regards to this and they are very cheap too! I've done research and found that they are more likely to fail on an older car than say a car of about 10 years old! My mate at worl has a 2001 8L S3 with a decat milltek and his turbo sounds to spool a lot quicker than another mates milltek hi flow sports cat! They are actuallyalmost half the cost of the hi flow sports cat too!
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Offline tony_danza

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Re: Milltek Decat Downpipe or Milltek Hi Flo Sports Cat
« Reply #8 on: March 13, 2011, 09:12:34 pm »
I had a Milltek 3" decat on a non res system - it wasn't so much any extra power I noticed compared to mate's sportscats, more that it revved like a bike! It spooled up and punched through to the redline so fast it was unreal.

« Last Edit: March 13, 2011, 09:14:24 pm by tony_danza »
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Offline Edition_30_P

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Re: Milltek Decat Downpipe or Milltek Hi Flo Sports Cat
« Reply #9 on: March 13, 2011, 09:26:02 pm »
@ Tony_Danza: That sounds right up my street, mate  :happy2: I've got the Decat sitting here ready to fit ans I've also located a 3" Hi Flow Sports Cat for the same money! Swaying towards keeping the Decat though  :evilgrin:
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Offline tony_danza

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Re: Milltek Decat Downpipe or Milltek Hi Flo Sports Cat
« Reply #10 on: March 13, 2011, 09:28:59 pm »
As long as you know the situation regarding the legality of it, then it's up to you.
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Offline Edition_30_P

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Re: Milltek Decat Downpipe or Milltek Hi Flo Sports Cat
« Reply #11 on: March 13, 2011, 09:30:20 pm »
Of course!
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Offline vRS_Pagey

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Re: Milltek Decat Downpipe or Milltek Hi Flo Sports Cat
« Reply #12 on: March 13, 2011, 09:46:32 pm »
I'm in the same situation as you mate, a decat will fail the MOT - unless you have a friendly mechanic - but the sport cat is double the price!  As far as performance goes as I understand the turbo will spool quicker with the decat and iirc hurdy posted some graphs which showed the power early on in the rev band was 90 bhp over the sports cat, and the torque curve was like Everest  :surprised:
I will have a search and see if I can dig up the post.  :happy2:

Edit: Have a butchers at this, particularly the second post by Hurdy.  :happy2:
http://www.mk5golfgti.co.uk/forum/index.php/topic,10109.0.html
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Re: Milltek Decat Downpipe or Milltek Hi Flo Sports Cat
« Reply #13 on: March 13, 2011, 09:58:39 pm »
Ceers, Pagey!!

Quickly read thru that and i'm 80% sold!
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Offline vRS_Pagey

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Re: Milltek Decat Downpipe or Milltek Hi Flo Sports Cat
« Reply #14 on: March 13, 2011, 10:03:09 pm »
Quote from: Edition_30_P on March 13, 2011, 09:58:39 pm
Ceers, Pagey!!

Quickly read thru that and i'm 80% sold!

For 380 bhp I would sell my wifes soul to the devil!  :signLOL:

I am having the precat filter removed from mine next month along with some other work, hopefully that should make an improvement over standard.  :evilgrin:
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