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Dual Exhaust

Discussion in 'Trucks and Trailers' started by TheChiefsLawnCare, Nov 24, 2007.

  1. TheChiefsLawnCare

    TheChiefsLawnCare LawnSite Senior Member
    Messages: 960

    I called a exhsut installer today and he said that if I was to run a true dual system on my 03 gmc sierra then i would void out my warrenty. So ive decided to go with jus a single muffler, however i dont want the standard comin out the bac crap, i want them to come out the side. However, i want it to look a certain way and havnt been able to finsd any pics on the internet of how i want it to look. So im hopin that someone on here would have done this to their truck the way that i want mine done. Soooo please post pics of your dual exhaust. Any help is worth it. thanks
  2. LALawnboy

    LALawnboy LawnSite Senior Member
    Messages: 457

    The best place I know of (where I got my exhaust done) is Supreme Muffler, right off Clearview. I think you're right in that if you get true duals, it will void your warranty. I think when they install true duals, they dismantle your catalytic converter and the exhaust will run from your headers. I've got the 1 in, 2 out exhaust system on my '02 silverado and have been completely happy with it. Now I know I don't have the same exhaust that you want (mine comes straight out the back), I'm sure if you tell the guys at Supreme what you want, they can do it for you.
  3. TheChiefsLawnCare

    TheChiefsLawnCare LawnSite Senior Member
    Messages: 960

    HAHA yeah thats where im gettin it done at. Thats the guy i called and they told me about voiding the warrenty. so what are u runnin, flows, magna, cora, etc???
  4. TBB

    TBB LawnSite Member
    Messages: 4

    Very few exhausts are done "true dual" any more. To have a true dual exhaust it is completely split where each exhaust manifold coming off the block has its own muffler. Basically you have four cylinders going into each muffler, but if you look under your truck the factory exhaust runs the exhaust manifolds into one pipe that leads into your catalytic converter then into the factory muffler. When my dad was in high school, late 70's & early 80's, he had a Pontiac Gran Prix that was true dual and they actually cut a notch in the frame for the exhaust second exhaust pipe and the muffler to run down the other side of the vehicle. Like you said, back then it wasn't a big deal but now I'm sure they won't do it because of liability issues. Today most dual exhaust systems just refer to having dual exit pipes coming out of a single muffler. I have a '99 Chevy and I was just under it tonight changing my oil, and I'm sure that your frame is set up much the same. If you look at your current exhaust you will see how it is routed and see that there isn't really any way to put a second cat and muffler anywhere under it without notching the frame. Were you wanting it to come out the side of the truck in front of the rear wheels? Did you want it to be under the bottom part of the quarter panel or notched into the body?
  5. Cantona

    Cantona LawnSite Member
    Messages: 51

    You can run true duels on the Sierra with cats. I had the set up on my 2000 Sierra and I installed to after market car sounds cats. Going to 2 spintech mufflers. Same set up I had on my WS6
  6. topsites

    topsites LawnSite Fanatic
    Messages: 21,653

    True dual exhaust needs aluminum headers, and two catalytic converters.
    But you can still increase the airflow otherwise, just headers and two mufflers still helps.
  7. LALawnboy

    LALawnboy LawnSite Senior Member
    Messages: 457

    I've got the Flowmaster 40 Series (I'm pretty sure that's the model #). I can't remember the guys' names over there since it's been about 2 years since I got my exhaust done. Supreme will be the only place I do business with from now on. They'll help you out with anything and don't make you feel like a moron if you don't really understand everything about the exhausts (like me) when you first get it.
  8. newz7151

    newz7151 LawnSite Silver Member
    from Tejas
    Messages: 2,419

    Well, thought I had a pic of where mine comes out (99 Silverado NBS), but all my shots are of the driver's side, so I'll try and take one tomorrow and post.
  9. TheChiefsLawnCare

    TheChiefsLawnCare LawnSite Senior Member
    Messages: 960

    great info, as for TBB's question, i want them 2 both come out the behind the rear tire, not next 2 the hitch. as for lalawnboy, yeah i no what u mean, everytime i call them, the guy is very patient. ill be goin to them when i get mine done. imma ge usin the flowmaster super 44. newz, if u could post that pic that would be great.
  10. Chop Stuff Up

    Chop Stuff Up LawnSite Senior Member
    Messages: 457

    Mine come out behind each tire with a 3.5" chrome tip. Mine's a '92 though. Probably the same concept. Basically its the single factory pipe that goes to the muffler and the muffler splits it out into duals. If you want a pic let me know.

    Alright I found an old pic from when my wheel fell off but you get the point. Is this how you wanted yours to run? I drew arrows to the pipes. If you need a pic under the body let me know. I'm pretty sure the 2 sections past the muffler were already pre-made and they just had to weld it right on.


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