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Dual Exhaust (Flowmaster) vs Single Exhaust (Magnaflow)

Discussion in 'Engine & Drivetrain' started by shovenose, Jan 5, 2017.

  1. shovenose

    shovenose Well-Known Member

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    99 Suburban Vortec 5.7. Currently it has a dual exhaust with a Flowmaster (40?) muffler and I hate the drone on the highway. I had a 95 Suburban TBI 5.7 in the past with a stock exhaust except for a Magnaflow muffler and it sounded better when driving on the highway and I'm about to move so my commute will be at least an hour each way. Will I lose any HP/TQ/MPG by going back to a factory style single exhaust? I mean it is already slow and gets poor mileage anyway...

    I want to do away with the dual exhaust because I'd rather the exhaust come out on the passenger side like stock vs the two pipes out the back - if I leave the truck running while I'm loading stuff in the back I can smell the exhaust which is annoying.
     
  2. HARDTRAILZ

    HARDTRAILZ Moderator

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    You wont lose anything except drone.
     
  3. shovenose

    shovenose Well-Known Member

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    Great! Thanks - the exhaust shop said "I might lose a few HP" so I just wanted to get a second opinion.
     
  4. HARDTRAILZ

    HARDTRAILZ Moderator

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    If it is not currently a headers/true dual setup, I think you wont lose anything. Flowmaster are not that great and Magnaflow seem to flow really well. The dual vs single is mostly for looks so I would go for what you seem to want and have in mind.
     

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