Exhaust bypass pipe

Discussion in 'Performance Lounge' started by SL350_SWINDON, Apr 13, 2014.

  1. SL350_SWINDON

    SL350_SWINDON Hardcore MB Enthusiast

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    Hi all, any advice on fitting an exhaust bypass pipe similar to the image: it's a basic y pipe that fits inline with the standard exhaust system with the leg venting to atmosphere. If it's too loud or not to liking the leg and be blanked off or replace the whole pipe with a straight to go back to standard. Any advice is appreciated. Thanks

    image-1943923890.jpg
     
  2. Nolander

    Nolander New Member

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    CL500
    These were popular in certain muscle cars in the 80s but prob been around for ages, used to have a valve which would open when the pressure reached a certain level, obviously the valve could be manually operated by the driver as well. I have never heard one myself but if they go before any muffling i imagine that the noise would be very loud and very raspy, much like a engine with err..no exhaust.
     
  3. Jim G

    Jim G Hardcore MB Enthusiast

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    Hi SL350,

    Fitting will be down to personnel choice really the louder you want the bypass sound to be place it as close as you can to your first cat (not too sure off your exhaust set up 1 or 2 cats) or to be quieter place it up near your back box, or somewhere in between.

    As Nolander says there should be a valve that will open and close either on a preset pressure or via a remote, much like Lee's (LeeC63) IPE set up that he recently had done.

    Can't comment on the sound though mate as i've never heard one in person, but i can imagine that a bypass pipe just after the 1st cat would be really loud :thumb: :bannana: :devil:

    One good point is that if they are clamped like the one in your pic, fitting would be a piece of cake just choose your position cut through the exhaust and done.

    It would be interesting if you do get one fitted, please update us with some pics and more importantly a sound clip :D :thumb:
     
  4. moonloops

    moonloops Hardcore MB Enthusiast

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    I've seen a lot of these valves fitted so they vent underneath the car - ideal for sucking in exhaust fumes back into the car.
     
  5. OP
    OP
    SL350_SWINDON

    SL350_SWINDON Hardcore MB Enthusiast

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    Moonloops that design is based on the popular ipe exhaust.
    I'm thinking of a different approach now, maybe a bypass pipe that is about 1" diameter which comes loops around the silencer box ( comes out of exhaust pipe and goes back into it after the silencer.
    Or cutting open the standard box, clearing it out and putting a smaller box inside with a straight perforated tube and welding it all up.
     
  6. JDMUK

    JDMUK Hardcore MB Enthusiast

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  7. OP
    OP
    SL350_SWINDON

    SL350_SWINDON Hardcore MB Enthusiast

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    I'm swaying towards a bypass pipe to divert around the silencer. Potentially with a manual valve inline so I can tune the noise to my taste. Something like the attached image with 22mm pipe.

    image-921593628.jpg
     

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