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Opinions: Exhaust turn downs before axle, good? bad?*UPDATE*I did it!

Discussion in 'The Garage' started by mrk5, Jun 9, 2004.

  1. mrk5

    mrk5 The Sticker Guy Moderator Vendor GMOTM Winner Author

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    I did a search on different exhaust set ups, but I couldn't find one that directly addressed doing turn downs right after the muffler. Just a few references to them.

    So, I think turn downs straight of a set of 40 series Flowmasters is what I'm going to do. I just want to know of any pros or cons.

    Right now I think the exhaust is choking the motor. I still have the original exhaust from the military 6.2 with mild 350 and Thorleys. It looks like 2.5" to the mufflers and 2.25" after. That can't be good.
     
  2. DBLAZER

    DBLAZER 1/2 ton status

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    Re: Opinions: Exhaust turn downs before axle, good? bad?

    I ran a set up like this for years, the real down fall for me was it was VERY loud in the cab. It resonated in the cb with top on and the doors on.
     
  3. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

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    Re: Opinions: Exhaust turn downs before axle, good? bad?

    Bad plan...

    Sucks when on a dusty road for one, and for two you'll choke on exhaust fumes.

    Rene
     
  4. BlazerGuy

    BlazerGuy 3/4 ton status

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    Re: Opinions: Exhaust turn downs before axle, good? bad?

    Like Rene said, if you don't asphixate(ap?) first then the noise and the dust clouds are a bitch! Save the turndowns for the pickups.... /forums/images/graemlins/grin.gif
     
  5. ratzila

    ratzila 1/2 ton status

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    Re: Opinions: Exhaust turn downs before axle, good? bad?

    I have run them on my /forums/images/graemlins/burb.gif & /forums/images/graemlins/k5.gif With the stock exhaust the fumes would come in the rear window but with the turndowns I never had any problems on my blazer. In my burb I didn't have any problems either way. But both trucks had 12" + of lift. I ran the 2 chamber flowmasters with 3" pipes & the noise was tolerable /forums/images/graemlins/thumb.gif
     
  6. Executioner

    Executioner 1/2 ton status

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    Re: Opinions: Exhaust turn downs before axle, good? bad?

    [ QUOTE ]
    I did a search on different exhaust set ups, but I couldn't find one that directly addressed doing turn downs right after the muffler. Just a few references to them.

    So, I think turn downs straight of a set of 40 series Flowmasters is what I'm going to do. I just want to know of any pros or cons.

    Right now I think the exhaust is choking the motor. I still have the original exhaust from the military 6.2 with mild 350 and Thorleys. It looks like 2.5" to the mufflers and 2.25" after. That can't be good.

    [/ QUOTE ]


    If you have to go through emmisions, it makes it hard for the tester to insertt the sniffer into the tailpipe.

    It also may not be street legal.
     
  7. 73k10sub

    73k10sub 1/2 ton status

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    Re: Opinions: Exhaust turn downs before axle, good? bad?

    The resonation is a big problem IMHO, even with a pickup. My Flowmasters (40's) are currently set up that way and with the bed on it was irritating at times. It is a problem mainly at idle and low rpm situations and will set off car alarms. I now have the bed off to do a frame shortening/flatbed/cage thing of some kind and have not resolved what to do with the exhaust routing.

    Ronnie /forums/images/graemlins/truck.gif
     
  8. mtn. burb

    mtn. burb 1/2 ton status

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    Re: Opinions: Exhaust turn downs before axle, good? bad?

    Been there, changed it to rear drivers side exit.

    Cons: Loud in cab. Kicks up lots of dust. Who cares about the smog test guy, but man, did he bitch about it.

    My flowmaster ties into pipe over axle, snakes up high, exits high. Trying to prevent crushing it.

    /forums/images/graemlins/burb.gif /forums/images/graemlins/usaflag.gif /forums/images/graemlins/usaflag.gif /forums/images/graemlins/usaflag.gif /forums/images/graemlins/usaflag.gif /forums/images/graemlins/usaflag.gif /forums/images/graemlins/usaflag.gif
     
  9. mrk5

    mrk5 The Sticker Guy Moderator Vendor GMOTM Winner Author

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    Re: Opinions: Exhaust turn downs before axle, good? bad?

    I don't have to do any emissions testing. If I did, I've a lot more to worry about than the exhaust after swapping out the diesel.

    The sound resonation is a big concern. Maybe I should go to 50's?
     
  10. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

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    Re: Opinions: Exhaust turn downs before axle, good? bad?

    I had 50's and 40's when I still had my 350...I found the 50's to be as bad as the 40's for resonation and both could easily set off car alarms

    Rene
     
  11. prerunner1982

    prerunner1982 1/2 ton status

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    Re: Opinions: Exhaust turn downs before axle, good? bad?

    are you just stuck on flowmasters or would you consider another brand? i know alot of guys that have/had flowmasters that are going to Hooker Aero Chambers. they dont have as much resonance and still sound good at WOT.
     
  12. Burt4x4

    Burt4x4 3/4 ton status

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    Re: Opinions: Exhaust turn downs before axle, good? bad?

    I ran two 40s like that and the only thing I hated the Dust clouds that would bellow out from under..sucked /forums/images/graemlins/weld.gif
     
  13. mrk5

    mrk5 The Sticker Guy Moderator Vendor GMOTM Winner Author

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    Re: Opinions: Exhaust turn downs before axle, good? bad?

    As long as the price is right, I'm open to others. /forums/images/graemlins/deal.gif

    I guess I would like to keep the resonance down while idling at a light. I have super turbos in my big block cuda and idling at a light would like to pound your head in. Reduced resonance is one of Flowmaster's claims to fame.

    I just want to be sure to have a nice deep note.

    I'll check out the Hookers. /forums/images/graemlins/waytogo.gif
     
  14. sr175

    sr175 Registered Member

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    Re: Opinions: Exhaust turn downs before axle, good? bad?

    I have mine this way and dont have any problems with dust or noise. I have a 2 chamber flow and have the tips behind the muffler. I suppose that you could not angle the exhaust down if dust is an issue.
     
  15. mrk5

    mrk5 The Sticker Guy Moderator Vendor GMOTM Winner Author

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    Re: Opinions: Exhaust turn downs before axle, good? bad?

    I'm thinking I will turn them out a little, so they kind of point at the bottom of the rear tires.
     
  16. CyberSniper

    CyberSniper 1/2 ton status Premium Member

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    Re: Opinions: Exhaust turn downs before axle, good? bad?

    I ran turndowns for a while but it caused too much dust. So I still just run the exhaust cut off just before the axle. It resonates pretty bad at idle. Above 1200rpm it doesn't resonate. It gives you a headache after a while. The reason why I don't have tailpipes is because I ran them over.
     
  17. rjfguitar

    rjfguitar 3/4 ton status GMOTM Winner

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    Re: Opinions: Exhaust turn downs before axle, good? bad?

    My dual 5" tips dump behind the rear axle under the gas tank at a 45* angle and I love it that way. Much deeper sounding and is lighter, more HP from less bends, and cheaper.
     
  18. mofugly13

    mofugly13 1 ton bucket of rust Premium Member

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    Re: Opinions: Exhaust turn downs before axle, good? bad?

    I have a Flowmaster 50 and a single 3" that turns down right behind the rear axle, and it is loud inside the cab while idling. I like the way it sounds off idle, though. I am thinking of fetting the exhaust shop to bend me a piece if 3" and bell the end so that it will slip on, and be able to be taken off. The way it is now, it is up and out of the way, nothing will hit, anywhere. Heres a pic.
    [​IMG]
     
  19. mofugly13

    mofugly13 1 ton bucket of rust Premium Member

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    Re: Opinions: Exhaust turn downs before axle, good? bad?

    Heres another pic of the muffler tucked way up high, following the frame rail. [​IMG]
     
  20. camok10

    camok10 1/2 ton status

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    Re: Opinions: Exhaust turn downs before axle, good? bad?

    I have my dynomax 3" set up like you are asking about and I havn't had any proplems with exahust in the cab, dust, or noise. I like it very much. Maybe I just lucked out /forums/images/graemlins/dunno.gif
    [​IMG]
     

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