Flowmaster 40 series

Discussion in 'Chevy Truck Accessories' started by BlackedOut010, Apr 18, 2011.

  1. BlackedOut010

    BlackedOut010 New Member

    Wasnt quite sure what category to put this in but figured id get the most feedback here. I drive a 2010 Silverado 5.3L. Im looking at ordering a flowmaster 40 series muffler but not quite sure what size inlet i need to order. Any help here?
  2. 2COR517

    2COR517 Epic Member 5+ Years 1000 Posts

    Probably ought to climb under the truck and take a few measurements.....
  3. Adam

    Adam New Member

    You should have 2.5 inch stock exhaust and would need the inlet to accomodate that. I would recommend welding the muffler versus clamps. Thats just my personal opinion from my experience. If you are planning to have duals make sure that you get the muffler that has dual exits. You will like the new sound. I have the 40 series flowmasters on mine and it sounds nasty! I went with the true duals though. Good Luck
  4. karz4life87

    karz4life87 Rockstar

    Your more than likely looking at a 2.5" inlet and outlet. I would just take the truck to a local muffler shop and have them get the size for it.
  5. silveradotrailblazer

    silveradotrailblazer Epic Member 5+ Years ROTM Winner 5000 Posts

    Flowmasters website recommends part # 953047. Its a 40 series with 3" inlet/outlet.
  6. Wage92

    Wage92 New Member

    is the exhaust currently on it stock?
  7. Tj07classic

    Tj07classic New Member

    buddy of mine has and 08 and he had 3" in and 2 3/4" out fit was perfect.
  8. BlackedOut010

    BlackedOut010 New Member

    yes, the exhaust is currently stock. thanks for the info guys. within the next couple of weeks i should have a few more things done. ill be sure and post pictures....
  9. foleyonbass

    foleyonbass New Member

    Just thought id mention...i have a 2011 5.3 silverado my inlet is 2.75 '' and my outlet is 2.75 ''. I just ordered a magnaflow my self 3'' in and out. let me know what you did to convert the 2.75 to 3 inch for your flowmaster.
  10. drillbit26

    drillbit26 Rockstar 100 Posts

    do all you people changing your exhaust have tuners or are you just doing it and dealing with the AFM issue. just curious cause I really miss having a loud truck

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