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Thread: 1.9 CDTi exhaust centre box

  1. #1
    Regular Member Ginge7289's Avatar
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    Default 1.9 CDTi exhaust centre box

    Hi can anyone tell me what this is for? I have just got a 2.0T twin exhaust that is straight through to the CAT.
    What are the pros and cons of keeping the centre box?

    Cheers

  2. #2
    Regular Member winnie2457's Avatar
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    If you have a turbo car then the less boxes te less back pressure which means quicker turbo spool up and better performance

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    Regular Member johnnyboy1985's Avatar
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    Would a de pre cat de cat n no centre pipe be loud?

  4. #4
    Full Member merikiito's Avatar
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    Vehicle : Insignia CDTi SRi NAV 160

    Trim : SRi

    Engine : A20DTH

    Year : 2009

    Mileage : 88000

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    Quote Originally Posted by johnnyboy1985 View Post
    Would a de pre cat de cat n no centre pipe be loud?
    No, Diesel Exhaust noise is nowhere near the sound that Petrols make.

    I have no centre box, cat and about to lose the precat and it sounds quiet until you put your foot down then it just growls lol
    Lois Griffin: Peter! You're bribing your daughter with a car?
    Peter Griffin: Ah, c'mon, Lois, isn't 'bribe' just another word for 'love'?

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    Regular Member winnie2457's Avatar
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    Mine was straight through all boxes removed but I have stuck the back box on as it was illegal for mot but sound wise makes no difference its not noisy at all

    Diesels just need a pipe no boxes at all only on turbo diesels thOugh

    The performance and mpg has shot right up for me

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    Regular Member Ginge7289's Avatar
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    Awesome, well thats going then lol.

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    Regular Member johnnyboy1985's Avatar
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    Same lol

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    Regular Member winnie2457's Avatar
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    Remove the cat too this is very restrictive and will increase bhp and mpg and is perfectly legal on a diesel and will not fail a mot

    Mine passed mot with no dpf cat and no pre cat with a reading of 0.6 on the smoke test with a fail limit of 1.5 so well with In limits

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    Regular Member Ginge7289's Avatar
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    Quote Originally Posted by winnie2457 View Post
    Remove the cat too this is very restrictive and will increase bhp and mpg and is perfectly legal on a diesel and will not fail a mot
    I have a replacement exhaust from a 2.0T and do not have the extra pipe to remove the CAT, so I guess that is staying on.

  10. #10
    Regular Member vxpenfold's Avatar
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    Vehicle : Vectra Hatchback

    Trim : Life(well it was)

    Engine : Z19DTH

    Year : 2005

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    too ****** right its coming off lol, you need more power so you can keep up with me lol, untill i decat/centre mine

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