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Thread: 5 Inch Downpipe To 4 Inch Exhaust?

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    bajaben's Avatar

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    5 Inch Downpipe To 4 Inch Exhaust?

    As the title suggests, I wonder if this is a good idea and if anyone has done something like that.

    I can not find a 4-inch downpipe anywhere, but I can get a 5-inch.

    I need to stick with the 4-inch because my BD Diesel exhaust break is for a 4-inch system.

    I need to replace my downpipe because the flex joint went bad.

    Currently, I have a 6-inch section of straight pipe just welded in there to replace/repair the flex joint.

    I'm looking for something more permanent and more stout.

    What do you guys think?

    Sent from my SM-G781V using Tapatalk

    2014 2055
    Deleted, tuned(DRD)
    Fully Build 68RFE by BD Diesel
    SXE 64.5 fixed vane turbo
    Inline exhaust break
    Stock CP3 and injectors

  2. Thanks IGOTACUMMINS, Corkey, watersupply189 thanked for this post
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    Watch Dog! Corkey's Avatar

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    Re: 5 Inch Downpipe To 4 Inch Exhaust?

    Quote Originally Posted by bajaben View Post
    As the title suggests, I wonder if this is a good idea and if anyone has done something like that.

    I can not find a 4-inch downpipe anywhere, but I can get a 5-inch.

    I need to stick with the 4-inch because my BD Diesel exhaust break is for a 4-inch system.

    I need to replace my downpipe because the flex joint went bad.

    Currently, I have a 6-inch section of straight pipe just welded in there to replace/repair the flex joint.

    I'm looking for something more permanent and more stout.

    What do you guys think?

    Sent from my SM-G781V using Tapatalk
    @DDP

    Do you happen to have anything in stock?

    II 60HP STICKS, II 33% CP3, II S464 2ND GEN SWAP, FASS 165 TITANIUM SIGNATURE SERIES, AFE INTAKE HORN, S&B FILTER, 5" TURBO BACK, ALPHAREX HEAD LIGHTS, 38X13.5X20 RAZOR M/T, MOTO METAL RIMS, 6" LA LIFT KIT, COMPLET MM3 KIT, BUILT TRANSMISSION, 6 BOLT REDHEAD STEERING BOX

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