1991 E36 318is cat delete

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  1. 1991 E36 318is cat delete 
    #1
    BMW Crazed
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    russ964's Car Details
    Model of Car:
    325i
    Year of Manufacture:
    1992
    Transmission Type:
    manual
    Car Body Type:
    coupe

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    I was told that by removing the cat of my car that it may free a few pony,s.
    The race 318,s had no cat in the exhaust, and my car is only for track use so i had a go today.
    But the cat dosnt unbolt its part of the front pipe and is on a bend, so was unable to just by-pass it with a straight pipe, so instead i cut a hole in the cat and removed all its insides, and welded back up.
    Now i think it does feal a bit better, revs easyer.
    But its now noisy, a high pitched raspy whine!

    Is this wot a 318is sounds like with no cat?

    Or is it due to the hollow cat box?

    Is it worth having a pipe made up to replace the hollow cat?

    More fun and games .
     
     

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    #2
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    TheEnd's Car Details
    Model of Car:
    540
    Year of Manufacture:
    1998
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    Cat gutting. It's the cheapest way to de-cat a car, but they will always be noisy.

    You could try a straight bit of pipe, but be very careful with the measurements incase it's welded up at a slight twist. What i've seen people do is lay the centre section on the ground, make a wooden frame around it, that holds the pipes at the correct angles, including screwing any flanges down, then the cat can be chopped out without anything else moving.

    Twin pipe de-catting is pretty easy if you do one at a time.

    With a straight pipe, it probably will be a bit less raspy, as some of that nose will be from the cat shell reverberating.

    A straight pipe should also get you more power, as the gasses won't head into the empty cat, expand, then have to be forced back down the pipe again.

    Remember to try your local scrap yards too, as they might pay you for the cat internals from the platinum coating.
     
     

  4.  
    #3
    BMW Crazed
    Car Details
    russ964's Car Details
    Model of Car:
    325i
    Year of Manufacture:
    1992
    Transmission Type:
    manual
    Car Body Type:
    coupe

    Join Date
    Jun 2010
    Location
    cheshire
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    So mr end do you think its best to have a piece made to fit?
    Cant cost much for a 2 foot length of pipe with a bend in it.
     
     

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