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Author Topic: manifold and de-cat  (Read 1720 times)

Offline ian24driver

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manifold and de-cat
« on: 17 November 2010, 23:00 »

As i have a stainless system from the cat back on the 8v i was thinking of going for the whole lot (de-cat pipe and stainless manifold).
 Anyone done this and recommend where to go for them?
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Offline Khare

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Re: manifold and de-cat
« Reply #1 on: 17 November 2010, 23:01 »
The standard manifold on the mk3 isn't restrictive. You won't see any gains from it (Ess_Three dyno tested it). Decat you will see some gains but it'll fail MOT.
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Offline Wayne

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Re: manifold and de-cat
« Reply #2 on: 17 November 2010, 23:32 »
As above not really a worthwhile mod.
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Offline sharki786

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Re: manifold and de-cat
« Reply #3 on: 17 November 2010, 23:33 »
mate has had a cat taken out from his g3 agg engine and says its alot more responsive now
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Offline Wayne

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Re: manifold and de-cat
« Reply #4 on: 17 November 2010, 23:35 »
Quote from: sharki786 on 17 November 2010, 23:33
mate has had a cat taken out from his g3 agg engine and says its alot more responsive now

I tried it once and gain 1bhp, modern cats are not too bad these day plus it is a pain to refit it for the mot.
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Offline sharki786

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Re: manifold and de-cat
« Reply #5 on: 17 November 2010, 23:37 »
Quote from: Wayne on 17 November 2010, 23:35
Quote from: sharki786 on 17 November 2010, 23:33
mate has had a cat taken out from his g3 agg engine and says its alot more responsive now

I tried it once and gain 1bhp, modern cats are not too bad these day plus it is a pain to refit it for the mot.

true but if you know the guy at the mot place then?  :wink:
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Offline Ess_Three

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Re: manifold and de-cat
« Reply #6 on: 17 November 2010, 23:49 »
Quote from: sharki786 on 17 November 2010, 23:37
true but if you know the guy at the mot place then?  :wink:

But for 1BHp? You'll not even feel that.
What's the point of running illegal and risking getting busted at a roadside check, for 1 measly BHP - if you even get that.

I manage to run 196 BHP fully legal on a 16v, using a cat and full MOT emissions...so I'd not expect miracle gains from an 8v.
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Offline sharki786

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Re: manifold and de-cat
« Reply #7 on: 17 November 2010, 23:55 »
Quote from: Ess_Three on 17 November 2010, 23:49
Quote from: sharki786 on 17 November 2010, 23:37
true but if you know the guy at the mot place then?  :wink:

But for 1BHp? You'll not even feel that.
What's the point of running illegal and risking getting busted at a roadside check, for 1 measly BHP - if you even get that.

I manage to run 196 BHP fully legal on a 16v, using a cat and full MOT emissions...so I'd not expect miracle gains from an 8v.

well thats why i aint done it, but his does have 190k on the clock   :shocked: and still pulls like a train!!!
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Offline shepgti

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Re: manifold and de-cat
« Reply #8 on: 18 November 2010, 00:18 »
i ran a stainless unbranded decat on mine. cant say it made much, if any differnce and i had the emissions checked and it was right on the edge of being a fail iirc
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Offline N900 MJT

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Re: manifold and de-cat
« Reply #9 on: 18 November 2010, 09:45 »
Thread Pirate!

How hard is it to swap the manifolds over? i think i have a hole in mine!
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