1994 E36 320is with 2.5 conversion - straight pipe vs a gutted cat

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  1. 1994 E36 320is with 2.5 conversion - straight pipe vs a gutted cat 
    #1
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    yardie's Car Details
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    Ok as the title says which do you think is better my cat started breaking down and i was wondering if its better to cut it out and use straight pipes or should i drop the cat and gut out inside of the cat. I know that the backpressure of a gutted cat is suppose to be better than just having straight pipes.
    any help would be nice thanks.
     
     

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    RYM
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    Yardie, my recommendation would be to just gut the catalytic converter however I am unsure of what your emission laws are in Jamaica.

    The use of just a straight through pipe will result in an increase in sound and the note will be more unpleasant, more raspy if that is a term to explain such a noise over there
     
     

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    Yardie have you changed your vehicle since joining as it says in your car specification box that you have a 1994 E36 320 coupe

    Just need to check the details to retitle this thread correctly
     
     

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    no emission laws or sound laws here in jamaica but its not the sound i want to go for i want which ever better cause i realize when like active makes there test pipe it still has like a pan there and i think its realted to the back pressure in the exhaust.
     
     

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    #5
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    it was originally a 320 as far as paperwork. I have since put in a m50 325 vanos engine full m3 suspension , driveline and brakes and some other little stuff. So ye it is a 325 motor that we are talking about
    thanks
     
     

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    RYM (03-11-2009),steve23002 (03-11-2009)

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    a straight pipe will flow better but bare in mind you will lose some low down torque but gain at the top end.

    cool user name too
     
     

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    will gutting the cat improve perfomance???
     
     

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    The insides of a catalytic converter restrict the flow. The exhaust gasses have to pass through a ceramic honeycomb which really restricts the exit
     
     

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    Ye i get what your saying about the inside of the cat but what im trying to find out is if i drop the cat and get out all the honey comb and other stuff in there will it be better i do that or just put in the str8 pipes ?? de gutted cat vs straight pipes
     
     

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    Quote Originally Posted by yardie View Post
    Ye i get what your saying about the inside of the cat but what im trying to find out is if i drop the cat and get out all the honey comb and other stuff in there will it be better i do that or just put in the str8 pipes ?? de gutted cat vs straight pipes
    Gutting the cat would be my choice, sorry my reference about the honeycomb was to answer the post below

    Quote Originally Posted by m3tobe View Post
    will gutting the cat improve perfomance???
     
     

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