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Exhaust back pressure

Discussion in 'Stock 1991 - 1994 Explorers' started by 04sd, December 17, 2008.

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  1. 04sd

    04sd Member

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    I've got a 4.0 in my Bronco II and I'm currently running the original 2.9 exhaust system minus the cat. The muffler is about 1/2 the length of the Explorer muffler. Do you think this is hurting performance and/or gas mileage?
     
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  3. tigercat

    tigercat Active Member

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    it all depends on the pipe diameter anything between 2.00"-3.00" is plenty:)
     
  4. Blacksheep Josh

    Blacksheep Josh Slinky+Escalator=Fun

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    I think there's a Bronco subforum on here... might have more luck over there. If not, I'd say message 410Fortune, from what I know he's the BroncoII expert round these parts, lol
     
  5. Anime

    Anime EF YEAH!! Elite Explorer

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    It's probably holding it back some, but even the factory exhaust for the 4.0 held it back.

    If you're worried about it, adding a 2.25" exhaust with your choice of a performance muffler might be just the ticket.
     
  6. Masterd

    Masterd Active Member

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    Yeah even the stock 4.0 system is probably holding it back a little.

    I think it'd be safe to say the 2.9 system might be marginally more so.
     
  7. 04sd

    04sd Member

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    I've got an almost new Explorer exhaust system, I'll have to measure the pipe size compared to the Bronco. I'd really like to keep it quiet so maybe I can fit the Explorer muffler, given I'm not running a cat it should still flow pretty good.
     
  8. Masterd

    Masterd Active Member

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    The cat(s) are probably where the most restriction takes place, and I'm also sure that the factory pipe is crush bent as well, probably hurting flow there too.
     
  9. HahnsB2

    HahnsB2 Active Member

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    Other than the muffler the 2.9 exhaust is almost identical.
     
  10. Anime

    Anime EF YEAH!! Elite Explorer

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    Stock pipe size is 2", but 2.25" makes a huge difference in terms of flow and exhaust gas velocity.

    If you want quiet but better than using the stock muffler, you can go with a Dynomax Super Turbo. They have mufflers with a 20" long case, like the 17747, which is what comes on the cat-back systems for 91-92 Explorers. It's pretty quiet.
     

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