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Dual exhaust before the rear tires??

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by blackwidowk5, Mar 23, 2001.

  1. blackwidowk5

    blackwidowk5 1/2 ton status

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    I want to switch to a true dual exhaust the exist in front of the rear tires. Right now i have a single flowmaster with dual outlets and i only have one cat. Does anyone know if there is anyone who sells pre-fabricate pipes for this? I know they have them for 2wd blazer but haven't seen them for the 4wd blazers. Any help would be appreciated.
     
  2. bigerik

    bigerik 1/2 ton status

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    I see by your profile that you're in Richmond, VA, so you don't have to pass emissions tests, right? I had the same setup as you and went to what you're saying. I wish I could scan in a picture now (give me a few days), because it looks so good. It also sounds and performs good. Here's what I did: I went to a muffler shop and had them put dual high flow cats and three chamber Flowmasters running from the Tri-Y headers to just past the rear axle as high up as possible with 3" pipe. They have chrome tips. I put in an H-pipe between the sides that also serves as a driveshaft loop (no way a kit is gonna be available for this setup). A custom exhaust allows you more choices. I got a driveshaft loop because I have a 6" lift and didn't want the front of the rear driveshaft to fail at high speeds, because that could polevault me into a dangerous roll (hey, it could happen). If you want low rpm torque, you might consider 2 1/2" tubing (it would bend better as in less or no wrinkles). I like the look of 3" pipe, though.
    Bigerik <A target="_blank" HREF=http://www.bigerik.coloradoK5.com>http://www.bigerik.coloradoK5.com</A>.
     
  3. schwinnd

    schwinnd 1/2 ton status

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    I dont know of anyone that sells the pre-fab pipes, but my Dad had a 74 K5 and he put the exhaust coming out in front of the rear wheels, the exhaust noise was terrible, because the pipes are right next to the doors, he changed back to behind the rear wheels about a month later because he couldn't stand the noise. There shouldn't be any clearance problems with the pipes behind, I'd keep it that way or just get a really good stereo[​IMG].

    Just collecting rusty mid-70's chevy's
    1976 Blazer, 1975 Vega SW
     
  4. CaptCrunch

    CaptCrunch 1/2 ton status

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    Sorry to jump in but how do you like the tri-Y headers?

    I believe that all the frt exit kits are for 2 wheel drive only... dynomas makes kits for headers or manifolds that will exit to the sides out back... otherwise would be cheap enough to have bent up custom.

    [​IMG]
    1987 Chevy K5 Blazer- 350 TBI
     
  5. DeesleK5

    DeesleK5 Registered Member

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    I think that set up would be nice and i have considered doing it on my 91 but if you off road and especially rock crawl, couldnt that make clearance problems, ie: smashing the tip against rocks and then knocking your rocker pannels. Just my thought. Mine come out the back behind the tires.

    Will
     
  6. Wheels

    Wheels 1/2 ton status

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    One other thing to consider on exiting in front of the rear tires. Those $150 rims will get dirty faster from the exhaust fumes. I had this set on another typ of 4-wheeler and was constantly trying to keep the rims clean.
     
  7. muddin4fun

    muddin4fun 3/4 ton status

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    In front of the tire?? It would take me five minutes to smash those things rock crawlin or even muddin!

    [​IMG]


    <A target="_blank" HREF=http://muddin4fun.coloradok5.com>http://muddin4fun.coloradok5.com</A>
     
  8. dyeager535

    dyeager535 1 ton status Premium Member

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    Not to mention that the exhaust is that much closer to the cab and door windows. Idling would be real nice...and if the mounts come loose, would probably be interesting when they hit the tire : )

    Dorian
    My K5 and Chev/Olds tech/links page: <A target="_blank" HREF=http://www.dorianyeager.com/index2.html>http://www.dorianyeager.com/index2.html</A>
     
  9. baldbandit

    baldbandit 1/2 ton status

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    Sorry to say this, and hope i don't hurt anyone's feelings but the exhuast exiting in front of the wheels reminds me of a F**D! All the new 1/2 ton fords have the exhuast exiting in front of the wheels and my personal opinion is that it looks like [censored]! But just my opinion.

    baldbandit


    "Have you outdriven a F**D lately?"

    Check out my site!
    <A target="_blank" HREF=http://www.baldbandit.coloradok5.com>http://www.baldbandit.coloradok5.com</A>
     
  10. lowlevell

    lowlevell 1/2 ton status

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    I was told that exiting the pipes in front of the rear tires is illegal. For the reasons that dyeager said. Ford Pickups (or any pickups) are legally allowed to do this because it is past the "cab". (where people sit). I still cant figure out why cars (namely old Vettes) get away with Lakepipes. =/

    One From None
     
  11. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

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    I run my Flowmasters outside the frame rail and have the exhuast tip dumping down and out in front of the tire at about 30 degrees. Sort of like side pipes...it sounds good and I don't get any worse fumes than I did before. The upside is now I don't smash my exhaust everytime I go wheelin'. The exhaust used to exit behind the tire at about a 45 degree angle and I was constantly having to fix it.
    This set-up works for me.

    Rene

    [​IMG]<A target="_blank" HREF=http://jules.coloradok5.com>http://jules.coloradok5.com</A>
     
  12. blackwidowk5

    blackwidowk5 1/2 ton status

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    Thanks for the input guys, i appreciate it. My understanding of the legal issue is that the pipes have to exit behind the cab in trucks. while i do take my truck offroad rock crawling isn't something i do so i'm not worried about it crunching the rocker panels. but i have heard that the pipes are alot more likely to get bent up if the exit behind the wheels. My exhaust comes straight back now and i've had to have the tips replaced a couple of time because steep creeks where the rear end of the truck started dragging. Thanks agian for the replies i'll have to check into some local exhaust shops.
     
  13. jarheadk5

    jarheadk5 1/2 ton status

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    Quick & easy way to find out what will get crunched when:
    Use a sheet of plywood (or sheetmetal, or insulation board, as long as it's reasonably flat and stiff). Lay it behind your truck so the wide side is against your back tires. Now lift the a$$ end up until it hits your exhaust, hitch, bumper, whatever. There's your first victim. If you ramp your truck, you can do this with a 2x4 about 4ft long behind the tire that's stuffed in the wheelwell to get a much better idea of what will hit when.

    [​IMG] Semper Maintenance!
     
  14. muddin4fun

    muddin4fun 3/4 ton status

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    The exhaust has to exit behind where ever passengers can ride. On a pickup, tips in front of the tire are fine. On a blazer, they have to go behind the tire (I used to be a safety inspecter).

    [​IMG]


    <A target="_blank" HREF=http://muddin4fun.coloradok5.com>http://muddin4fun.coloradok5.com</A>
     
  15. fr8train

    fr8train 1/2 ton status

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    Ummm..... Why do they have to be placed in the back of the tires? Its kinda of a question that is going to be effecting me sometime in the future.

    [​IMG]
     
  16. muddin4fun

    muddin4fun 3/4 ton status

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    You have to have the exhaust fumes exiting behind where passangers can sit. I say CAN cause origianlly the vehical was designed so passengers can sit in the back (instead of like a pickup) and that's what they go by. They don't want exhaust fumes to come up into the inside of the truck. I think that you should be able to put your exhaust anyway you want it cause it should be your choice whether or not you want to breathe exhaust, not the gov's decision, but hey, I guess they're just looking after us (and taking our money at the same time).

    [​IMG]


    <A target="_blank" HREF=http://muddin4fun.coloradok5.com>http://muddin4fun.coloradok5.com</A>
     

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