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Thread: Cat or de-cat

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    'LS' Member
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    Cat or de-cat

    First post on the new site, no one replied on AC

    Looking at getting a new exhaust for the sport (probably Sportex). Current setup is de-cat pipe into Powerflow centre section into Rage back box. My question is which would sound nicer, a de-cat pipe with centre silencer or vise versa having a cat with a straight through centre section.

    All comments appreciated

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    'GSi' Member
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    My corsa with a decat and straight through center section and piper backbox wasnt that loud,
    Its not really a question people can answer people might not like exhaust sounds that you do, best bet is to try what you want and change it if you dont like it

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    Diesel lover Hardcore's Avatar
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    The cat does very little to change the noise of the exhaust but can sometimes make it a bit more tinny or raspy without.
    I think sports manifold (4-2-1) > normal cat > sports centre section > sports back box is the set up i'd go for.

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    Depends also on whether your going for a mild steel or stainless steel system and how deep your pockets are.

    I had a stainless decat with sportex catback (mild steel system) this was disgustingly loud and raspy with awful cabin drone.

    Binned the sportex and paid out for a piper stainless steel cat back system (still with stainless decat). This is a dream, drive along normally and you wouldn't think the only silencer was the backbox, only when you boot it you get a deep bark which turns into a crisp rasp up the rev range and pops all over the place (Liam on here can vouch for the noise).

    It's worth to pay out that little extra and you get a whole lot more

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    Quote Originally Posted by Hardcore View Post
    The cat does very little to change the noise of the exhaust but can sometimes make it a bit more tinny or raspy without.
    I think sports manifold (4-2-1) > normal cat > sports centre section > sports back box is the set up i'd go for.
    Decat made a massive difference on my focus I recon doubled the noise

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    'LS' Member
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    Cheers guys, de-cat makes a fairly noticeable noise increase on mine too. Would be nice to be able to play around with different set ups but that just costs . Gonna go de-cat, centre silencer, uprated back box see how it sounds, better manifold too at some point.

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    'VXR' Member Vegas's Avatar
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    I thought this was a thread about murdering or not murdering a cat

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    'LS' Member
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    That was covered in my other thread...

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    'VXR' Member Vegas's Avatar
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    Ahh only saw two posts from you, and both in this thread. So assumed I hadn't missed anything

    Link
    Please

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    'LS' Member
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    Yeahhhh it was a joke

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    Administrator Dave's Avatar
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    This is a video of my old brocade 1.6 sport. Had a sportex "race" system on it. Straight through middle section. 3" backbox.

    http://www.youtube.com/watch?v=FrsE-2ieQRE
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    Cheers Dave. Been reading up on stainless steel vs mild steel exhaust systems, my findings are that there isn't a noticeable noise difference and the only benefit of stainless is it lasts longer.

    Not planning on having the car for that long so gonna go mild steel and save some .

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    From personal experience there's a big difference. I have 2 videos in my project thread somewhere of stainless vs mild, or go on my photobucket and they are there somewhere :thumbup:

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    Diesel lover Hardcore's Avatar
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    The sound difference i'd imagine comes mostly from the design, shape and materials used inside the silencer, not from the material the exhaust is made from.

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    Administrator Dave's Avatar
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    Yeh I don't think it's actually the metal that changes the sounds. Although I do think generally that stainless systems are raspier... But I'd say this is down to silencer design, not just because its stainless..
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