2000 Crew Cab Dually “Waylon”

Discussion in 'Member Trucks' started by JSlezak83, Mar 22, 2019.

  1. andy396

    andy396 GMT400 Enthusiast

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    I don't feel so bad about my 7mpg going up into the PA mountains with a 6K load and 9mpg coming back now. :)

    Something I've been considering for a new exhaust system, mainly because I'm cheap and I'd like to retain the all stainless steel system, is adapting a 2007+ 2500HD/3500HD 6.0L exhaust system. I was looking at my dad's and I think I'd call it an upgrade above the Walker bus muffler. If you wack it off right after the cats it's a nice dual 2.5" into 3.5" Y-collector going into a GIGANTIC single 3.5" in/out muffler. I'm thinking it might be possible to find one of those systems in the boneyard for a reasonable price. I think it's the 3.5" out that entices me the most. It's also got a nice mellow rumble to it and probably flows pretty decent based on the HP they're able to get out of that LS motor.

    I couldn't find a good diagram, but you can get the idea from the pictures below. I'm sure there will be some cutting and welding involved so probably not a straight forward swap. In the end, I'll probably end up going with a bus muffler like you one day, but I will keep my eyes out for this option.

    upload_2020-7-1_11-9-10.png
     
    Last edited: Jul 1, 2020
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  2. Stumpy

    Stumpy Heavy Chevy

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    Yeah that exhaust is pretty quiet, but has a nice mellow sound. After my last truck had dual Flowmasters, and 33" mud tires, I knew I would keep my '16 2500 stock, and it's been a much better in cab towing experience. The stock muffler is indeed gigantic, probably a good 20-25 gallons in size. lol
     
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  3. Supercharged111

    Supercharged111 I'm Awesome

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    Are your rigs holding OD? I just did 200 miles round trip camper and trailer and did better than 6. If I hadn't my ass would have been walking home. Now when the wind kicks up that's another story and, if I'm honest, this setup did 5.5mpg without the blower on the interstate. Walker bus muffler, 4" tailpipe, all the rest still stock.
     
  4. andy396

    andy396 GMT400 Enthusiast

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    During this last trip of mine it held OD for anything, I’d say, less than a 3-4% grade. When I hit those 6-8% grades she kicked down to D or 2nd. On one 12% grade after a hairpin switchback it stayed in 1st. I probably could have reached 2nd by the top but didn’t want it screaming at 4000+ rpm for most the hill. Instead I just lugged it on up at about 3300 while I watched my father-law pull away from me with his 10,000lb camper and ‘15 Cummins Ram. I’ll be honest, I was kind of disappointed. I thought it would do better than that up that hill. If I had a running start maybe it would have held 2nd? It definitely has me second guessing moving up to 265 or 285 tires without doing an axle gear change.
     
  5. Supercharged111

    Supercharged111 I'm Awesome

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    Do headers and a tune. I plan to do shorties, 3" head pipes, and keep my bus muffler.
     
  6. JSlezak83

    JSlezak83 I'm Awesome

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    I couldn’t say what grade it would down shift for, but it’s not like I was so far into the pedal that it was hunting.

    I’m thinking that ‘411 I picked last year will be in the mail for a reflash soon. I’m sure if I gave this thing the timing it wants it’d prob be much better off. Hell, I’ve even been thinking a camshaft upgrade might be in the future.
     
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  7. Supercharged111

    Supercharged111 I'm Awesome

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    Now we're talking. I expect some updates on the quick fast now. Don't leave me hanging.
     
  8. JSlezak83

    JSlezak83 I'm Awesome

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    Haha. Obviously none of this has gone to the CFO for approval. I’d think I could sneak a PCM tune past easy enough, but she might catch on when I’m elbows deep in a bumpstick.
     
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  9. Supercharged111

    Supercharged111 I'm Awesome

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    Isn't there an alternate procurement process in place?
     
  10. JSlezak83

    JSlezak83 I'm Awesome

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    Yeah...those coffers need to be refilled.
     

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