4" Exhaust?

Discussion in 'Exhaust' started by RDF1, Apr 11, 2018.

  1. GarrettGmc

    GarrettGmc I'm Awesome

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    How low is the truck. The height will affect the sound
     
  2. RDF1

    RDF1 I'm Awesome

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    It's factory with 2" lowering shackles

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  3. RDF1

    RDF1 I'm Awesome

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    I'm starting to rethink the turn down. Might chop the tail pipe off 6" and angle it toward the rear instead of straight down.

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  4. GarrettGmc

    GarrettGmc I'm Awesome

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    Be careful abt the heat going back to thou. I'd think abt and turn down but angled more like a side exit.
     
  5. RDF1

    RDF1 I'm Awesome

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    Yea when I get it on the lift I'll snap some pics.
    I can trim it and put 2 more pie cuts on it to angle it rearward and a little outboard.
    Fiberglass roll pan is the only thing that bothers me.

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  6. RDF1

    RDF1 I'm Awesome

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    I'm kinda excited now. This is the first exhaust I've done front to back.
    It was something crazy like 450" of welding on this silly exhaust. I just finished welding all but the awaiting Vbands and that's it.

    [​IMG]

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  7. Sparkysikes

    Sparkysikes I'm Awesome

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    Don't do the turn down. On a lowered vehicle it'll drone like crazy. I did some in front of tires with turn downs and it was loud as fak and drones crazy. Lucky me I whacked one coming into a driveway and ripped it off so the other one followed quickly.

    On my diesel I have a 4" and the mandrel over axle had this sweep that rolled the tip kinda down kinda back. I got some resonance so I slashed it to it faces 90% side and that solved it. Good luck
     
  8. NightRunner

    NightRunner Supporting Member

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    I had a full 4.5" Turboback exhaust on my 2002 Subaru WRX. Turbos love big exhausts if you can get over how loud it'll be. Building this truck for performance I assume?
     
  9. RDF1

    RDF1 I'm Awesome

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    I'm Goin to try it with the 90* turn down. That way I can test other stuff with it. If it's quiet, I'll ride with it. If it drones or something I don't like I'll shorten it and put a 45-60* turn back on it instead.


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  10. RDF1

    RDF1 I'm Awesome

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    4.5" on a 4cyl? That's a whole lot of exhaust flow for that little motor.

    It's just going to be a Daily driver I'll take to the track and have fun with.

    I really wanted to do a 3.5" exhaust with large mufflers. But after in looking for 2 weeks and coming up bout half dry I went with 4" I had at work. Shipping on 3.5"x10' stainless pipe was $100+.

    The resonator and muffler was $130? Off Amazon. And Vbands were $40. Throw in free stainless pipe and it's what I went with.
    We went from 3" to 4" on my buddy's 5.3 with a S476/87 turbo and it made a pretty big difference in spool time and had to add fuel above 5000 rpms so it helped a good bit.

    My goals are simple.... quiet, 25mpg, 10s in the 1/4 and not burn a whole lot of money on it. I'll prolly have less than $4000 in the whole thing when I'm done.
    The truck was kinda free. I did a lot of work for a buddy and he gave it to me. And I had alot of these parts left over from past projects.


    4" Vbands come in today. Fixing to get under there and start welding some more.

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