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  1. #1
    Member Array
    Join Date
    Jul 2006
    Location
    Melbourne
    Car:
    MX83 cressida
    Quote Originally Posted by dsp26 View Post
    actually if your not going to get a metal cat may as well keep the factory metal one.

    ceramic ones get murdered by exhaust pop especially if it happens a lot

    Here:
    http://www.ozhonda.com/forum/showthread.php?t=80166
    ...and how often do you think this happens on a stock engine?!?
    A basic hi flow cat is definately worth doing, as i said, so long as you are not putting down 800hp!!

  2. #2
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    May 2006
    Location
    Brisbane
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    380GT,XTrailSTR
    Quote Originally Posted by Kiz_EG6 View Post
    ...and how often do you think this happens on a stock engine?!?
    A basic hi flow cat is definately worth doing, as i said, so long as you are not putting down 800hp!!
    lol.. ok... changing any part of the exhaust system will increase exhaust pop if you haven't noticed, especially on straight through systems.... oh and it always happens when you back off throttle....

    the purpose of the cat is to ignite/burn uncombusted gasses...

    but your right it rarely happens on a STOCK engine thats backpressured which he doesn't have

    and any additional power that a cat can provide doesn't have much to do with size but rather the surface area of the catalyst, because an efficiency of a cat is also graded by how hot it can get.... efficiently burning the uncombusted gasses that pass through increase the scavenging effect of the exhaust system as it again accelerates gas flow out the exhaust... uncombusted gasses cool down the exhaust and slow down flow and reduce vacuum.
    Last edited by dsp26; 10-12-2007 at 08:28 PM.
    Quote Originally Posted by Slow96GSR
    If 1 person has had bad luck with a product don’t condemn it until you yourself have tested it. Now if 10 pros have tried it and it sucked then I would trust their opinion.

  3. #3
    Member Array
    Join Date
    Jul 2006
    Location
    Melbourne
    Car:
    MX83 cressida
    Quote Originally Posted by dsp26 View Post
    lol.. ok... changing any part of the exhaust system will increase exhaust pop if you haven't noticed, especially on straight through systems.... oh and it always happens when you back off throttle....

    the purpose of the cat is to ignite/burn uncombusted gasses...

    but your right it rarely happens on a STOCK engine thats backpressured which he doesn't have

    and any additional power that a cat can provide doesn't have much to do with size but rather the surface area of the catalyst, because an efficiency of a cat is also graded by how hot it can get.... efficiently burning the uncombusted gasses that pass through increase the scavenging effect of the exhaust system as it again accelerates gas flow out the exhaust... uncombusted gasses cool down the exhaust and slow down flow and reduce vacuum.

    I read the link you posted, if thatn is the price you got on a metal cat then i would have to agree with you, just some of the prices i've seen are ridiculous.
    Also i've never had a problem with my standard hi flow and that was with 4:1 extractors and a 2.25" cat back, it popped a bit, but you sorta had to try to make it do it!!

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