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Dual Exhaust for 90 Jimmy?

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by 90Jimmy4X4, Sep 12, 2002.

  1. 90Jimmy4X4

    90Jimmy4X4 Newbie

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    I need a new exhaust and was wondering if I can put a dual exhaust on. I can see where I would rout the pipes and put the cat converters at. I just need to know if it can be done on a 90 Jimmy. I'd probably use 3 inch pipes and 40 Series Flowmaster mufflers. Thanks for any help.
     
  2. MNorby

    MNorby 3/4 ton status Premium Member GMOTM Winner

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    I dunno about the routing part but I have HEARD that dual 3" pipes won't give you much backpressure and harm your low end power. I went with dual 2.5" pipes with wannabe flowmaster turbo muflers and works pretty good.
     
  3. dyeager535

    dyeager535 1 ton status Premium Member

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    Fill out your profile, might have some insight based on legality at least. If you are in an emissions checking area, especially one with visual, duals (even with two converters) will likely cause you to fail, as they were not an option your year.

    Cat-back you should have no problems running whatever you want, but most people here you ask, will say single 3" is perfect. I'm of the same opinion, dual 3's would look silly IMO.

    Getting real crazy, but headers, 2.5" y-pipe into a high flow cat, with either dual 2.5" outlets, or single 3", and the corresponding number of exhaust tips, would probably be pretty cool.
     
  4. jjlaughner

    jjlaughner 3/4 ton status

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    I'm thinking about H piping my 87 but I'm worried about the gas fill pipe on the passengers side and where I can have my H-pipe cross at!? I think it was jegs, Dynomax 2.5" cat, H-pipe, then dynomax turbo muff 2.5", up and over the rear axle, exit either side of the reese hitch at a 30deg angle out left/right. Anyone have pics of H-pipes and how to get about driveshafts and still keep them above frame level? Jeremiah
     

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