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Thread: Question about sports cat's

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    Default Question about sports cat's

    Browsing fleabay i came accross a couple of sports cats.

    A Magnaflow 300cell, £60 new and a 100Cell generic one for £100.

    I have a number of questions regarding these;

    1) Whats the difference in the number of cells
    2)I have a 1.8 so willl this be a worthwhile mod?
    3)Do i jsut swap them with the current cat? Easy to do?


    Many thanks

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    The number of cells is effectively the number of cells per square inch (CPSI) across the cat face. Clearly the higher the number, the smaller the channels through the cat, as there are more per square inch.
    To be really anal, you also need to know the wall thickness. Smaller numbers of cells doesn't necessarily mean better or worse than higher CPSI. Cat activity varies between the CPSI, as different types of complex interactions occur with the flow and the catalysation chemistry.

    What you really need to know is the max restriction of the cat, at what flow and temp. Then you can do a comparison between the 2, lower restriction would prob be better for power from engine, BUT emissions reduction may suffer as a consequence.


    I really don't know if you will get significant power gains by replacing the existing cat with a 'sport' cat - I would have to say that a true 8-10 BHP gain would be optimistic IMO.

    If you buy the correct part for your car, it should be a straight swap for the old one. Unless you're doing other stuff, like moving the 'cat back' etc

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