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  1. #1
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    downpipe exhaust size

    il shall be making and fitting a side exit exhaust to my clio/volvo engine the down pipe that il be modding is off a 200sx and is 3 inch il be fiting it to a normal clio exhasut which is about 2 1/2 inches is this going to make a loss in power as i want to fit my silenced decat and maybe cat for mot time also are there any tips ect i can buy to weld onto the end of the pipe ones ive finished it what do you guys do cheers

  2. #2
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    Re: downpipe exhaust size

    might get a slight bottle necking, but im not sure how much it would effect it proformance wise..

  3. #3
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    Re: downpipe exhaust size

    bottle necking ?

  4. #4
    East Midlands Regional Rep Os8472's Avatar
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    Re: downpipe exhaust size

    Your using a 3inch 200sx downpipe modded to fit onto your 2 1/2" sidey right?

    Can't see a problem with that, most people use a 2 1/2" turbo back system, having the first bit in 3" isn't going to hurt perfromance

  5. #5
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    Re: downpipe exhaust size

    yeah will be in 3 inch on the down pipe and il put a reducer in before the cat /decat pipe then it will be in 2 1/2 pipe from there

  6. #6
    East Midlands Regional Rep Os8472's Avatar
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    Re: downpipe exhaust size

    Quote Originally Posted by reevio View Post
    yeah will be in 3 inch on the down pipe and il put a reducer in before the cat /decat pipe then it will be in 2 1/2 pipe from there

    As long as the reducer gives a nice clean flow from 3" to 2 1/2" shouldn't be a problem

  7. #7
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    Re: downpipe exhaust size

    yeah its a stepped cone reducer nice and smooth and wont have any steps in it as the 2.5 inch and 3 inch step are next to each other also i may put a flexy joint in too just so theres no pull on the turbo from the exhaust system

  8. #8
    Non-member dave r5's Avatar
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    Re: downpipe exhaust size

    u got any piks on what yr down pipe looked like fella

    mine ended up like this (see pik)

    dont like it tho
    Attached Images Attached Images   

  9. #9
    Non-member TrixNFlix's Avatar
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    Re: downpipe exhaust size

    Dave what the feck is that

  10. #10
    Non-member rs250nut's Avatar
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    Re: downpipe exhaust size

    Quote Originally Posted by dave r5 View Post
    u got any piks on what yr down pipe looked like fella

    mine ended up like this (see pik)

    dont like it tho
    Is that a divided flange, seperating the wastegate flow from exhaust gas?

  11. #11
    Non-member dave r5's Avatar
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    Re: downpipe exhaust size

    i know it dont look pretty but its all i could come up with
    it works tho an saw me to 223 bhp granted it only lasted 3 days but boy it was quick haha


    yeah it a divideing flange.

    the waste gate was atmospericly vented.

    it has been re made now tho due to false afr readings
    and that it was so feking loud

  12. #12
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    Re: downpipe exhaust size

    mine does the trick

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