2.5” vs 3.0” muffler system

Discussion in 'General Truck Forum' started by gmctrucks, Jan 14, 2018.

  1. gmctrucks

    gmctrucks Full Member

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    I have wanted to go with 3” pipe and shops have said no it’s going to mess up your truck power.
     
  2. dirtrider73068

    dirtrider73068 Senior Moderator
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    I have 3 inch on my truck its run into a 3 inch flowmaster 40 series dump under the bed. I don't feel ill effects from having a 3 inch exhaust on mine. It sounds good have good punch off the line, just on the top end running down the highway at 70 punch it and try to pass not whole lot there but enough to get by.

    Like to see them put it in a truck, with a tranny and gears then run a dyno and see what happens. There are alot more options when you can gear it to get that power and torque on the road and get moving plus the weight of the vehicle its in takes power and torque as well. Plus what laws are going to let you run open headers to get the full 600 horses out of the motor anyway, you have to put mufflers on.
     
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  3. MikeG

    MikeG Full Member

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    I have a 3" Cat back and I also have no issues.
     
  4. jkeaton

    jkeaton Full Member

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    Mines 3" out of the converter to a 3" in/3" out glass pack, then 2-1/2" on back.
     
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  5. MikeG

    MikeG Full Member

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    The more I thought about it I can't understand how it is bad/ going to mess up your rigs power.......? Yeah, maybe if you were crazy enough to run 3" pipes and nothing else, then you will probably have a problem at some point. If any thing I can only see bigger pipes as a benefit, i.e. helping the exhaust exit the engine quicker and more efficient.

    I can definitely be wrong though......:hah: it has happened in the past.
     

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