1998 E36 318is - De-cat or not

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  1. 1998 E36 318is - De-cat or not 
    #1
    a1y
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    Me cat has gone on th car ! So gotta price from me local place and they want £160 for a new one which i dont think is to bad. But should i look into getting a ss made up ? with a de-cat?

    How do they run with a d-cat on them?
     
     

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    If you de-cat the chances of it passing an mot will be very slim, look around for a second hand cat from ebay or breakers as they will be less than half the price, you can still de-cat the car but will need to put it back on for mot, de-cating may improve performance slightly, what is wrong with the cat? if its not rattling you could put some good quality engine cleaner, (best to get it from an mot station as its better than what you get in the shops) in the fuel first that should de-coke the cat etc..
     
     

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    the wholes things making a nice rattle noise!!

    think i will ring around a few places for prices ! dont wanna risk ta second hand one just incase its if'y . plus would have to sort fitting anyway .
     
     

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    If its rattling then you CAN remove it and soak it internaly by filling with water, then smash the internals out. I say CAN as its highly toxic and not a great idea as such. I did a few and the water damps dust, I used a good carbon filter mask too. This offers most of the advantages of a decat and is OEM quality, fit and look.

    However, Decat is going to give emmissions problems, no law says you have to have a cat according to the big MOT book, but a cat equipt car falls into a tighter emmissions band, and meeting the requirements after removing the cat is rare. You risk a fine and will have to get one for MOTs so why not just leave one on full time? Performance gains are next to nothing, and many cars loose power as its a ballanced system designed to work WITH a cat.
     
     

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    Also if you do de cat your car you have to remount sensors on the ouside of the exhaust to stip the producing error codes
     
     

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    Do decat pipes not come with provision to bolt eh sensors on then? Thats poor workmanship IMHO. Most decat pipes have the holes for refitting temp sensors and lambda etc, and normaly spare M18x1.5 bung for wide band, and a M10X1.5 or M10x1.25 for EGT or the like. BMW ones should be the same???
     
     

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    yer but if you mount the sensors back on the decat pipe it produces a fault code to say the cat isnt working so tou have to re mount the sensor on the ouside of the exhaust so it gets fresh air to it therefore fooling the sensor into thinking the cat is working well
     
     

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    Ah I see. Post cat lambda sensor. Fair enough
     
     

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