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Thread: How to Quieten an Exhaust

  1. #1
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    Default How to Quieten an Exhaust

    Hey All,

    Never thought i would be asking this question if i am honest.!!

    Got an MIJ Mid Sport CatBack on my Vec-C 2.0T. Sounds very throaty across the board, but its now starting to get a bit irritating.

    What would be the best way to tone it down a bit so its not so obvious when driving? I can only think that a mid box could drop the dB's, but if a mid box was inserted, would it have much of an effect on the Re-Map which the car has?

    Any suggestions welcome!

    Cheers
    Aidi

  2. #2
    Regular Member Chunklamb's Avatar
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    Vehicle : 330D (13) Tourer 258 Auto & Signum 1.9 CDTI (07) 150 Auto

    Trim : M Sport and Design

    Engine : Z19DTH

    Year : 2007

    Mileage : 38100

    Default

    Have a box welded in at the Y-piece

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    Exactly what i thought, but will be adverse to the engine map?

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    Regular Member Chunklamb's Avatar
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    Vehicle : 330D (13) Tourer 258 Auto & Signum 1.9 CDTI (07) 150 Auto

    Trim : M Sport and Design

    Engine : Z19DTH

    Year : 2007

    Mileage : 38100

    Default

    I wouldnt think so, just a box with some baffles shouldnt be restrictive of air flow?
    Last edited by Chunklamb; 26th July 2012 at 22:07. Reason: spelling!

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    Regular Member richy1974's Avatar
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    Will not make much difference only a race cat will make a difference

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    Cheers, I think ill take a trip out tomrrow afternoon and see whats in my local area to possibly get something done

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    Default

    With some engines, the Signum has a middle box even though the Vectra doesn't, so it doesn't affect the engine.

  8. #8
    Full Member Caveman_nige's Avatar
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    Vehicle : Vectra and a Signum

    Trim : top of the line in both

    Engine : Z18XE,Z19DTH,Z20NET

    Year : 2006

    Default

    i have kept my middle box on my signum for this very reason.. I have a lovely rumble sound to mine but its not too loud to annoy me and my wife and daughter sleep fine in there in a journey...
    My old Signum, the animal; she now rests in pieces in several other members cars.. https://www.vectra-c.com/forum/garag...vehicle&id=200
    The wifes vec show car, started as a standard daily driver and ended up like this. https://www.vectra-c.com/forum/garag...vehicle&id=709



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    Well, found a custom place not too far from me, they a fabricating a middle box as I type, so hopefully it will do the job and take some of the lareyness away, but still leave it with a nice sounding pipe.

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    Gotta say, i'm well impressed. The new mid box has taken the edge off the raspy sound, and brought it down to a very much more tolerable level. Excellent service from the place i had it done - http://www.infinity-exhausts.co.uk/. Got chatting about the MIJ system i have on the Vec already, and rate their work very high.

    Its gone from a growl to a lovely purrrr. I know some will say it defeats the object of having a mid sport MIJ system, but each to their own... and i know it will make the wife happy.... might be worth every penny (if you know what i mean!!)

    Rgds
    Aidi

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