#395547 - 02/02/12 02:24 PM
Re: Swapping Decat for Standard Cat
[Re: Duff]
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Registered: 09/04/11
Posts: 80
Loc: Northamptonshire
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I imagine you wouldn't see a noticeable difference, but putting a sports cat in place of a decat pipe would cause a restriction of some kind surely? And therefore a loss in power.
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'06. 57i, Roose hoses, Milltek 4-1 manifold, -35mm
I wanna go fast!
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#395549 - 02/02/12 06:09 PM
Re: Swapping Decat for Standard Cat
[Re: Ashley6]
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 Site Supporter
Registered: 15/10/08
Posts: 15118
Loc: Harpenden, Hertfordshire
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Someone recently did a test on the RS and rolling roaded the same car with standard cat, sports cat and a decat... The results are fairly obvious
Whether its noticeable or not is another thing, obviously a higher horse power car it will release more ponies so be more noticeable
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 407BHP and 340lbft TD GT28/32 hybrid turbo, 3inch decat, 2.75inch exhaust, air intake + large MAF, injectors, fuel pump, tubular manifold
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#395552 - 02/02/12 11:20 PM
Re: Swapping Decat for Standard Cat
[Re: LiestaST]
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Registered: 16/01/12
Posts: 739
Loc: Fleetwood, Lancashire
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Quote:
If you have your miltek system with the standard cat on it will be s**te.
My system must be REALLY BAD then 
Standard lol
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#395554 - 03/02/12 06:33 AM
Re: Swapping Decat for Standard Cat
[Re: FroSTy]
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Registered: 08/03/08
Posts: 11807
Loc: essex
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Quote:
I also read that a sports cat wouldn't lose power compared to a decat.
...I'm not saying I believe that though 
This is true but only if the car has not been maped,ie rs focus made les power then standard with decat and full milltek then the map went on then boom 250bhp + its all to do with afr
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#395555 - 03/02/12 08:07 AM
Re: Swapping Decat for Standard Cat
[Re: kenny]
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Registered: 14/07/11
Posts: 1791
Loc: Mid Wales
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Making a de-cat for mine tomorrow, so long as I can find the right sized nut for the O2 sensor so that I can put this back on the exhaust to stop the CEL coming on. Will let you all know how it goes..
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