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  1. #1

    Default New exhaust system???

    Will a new exhaust system (aftermarket) 5" give you any better GPM......I mean MPG I hear yes and no, what do you guys think?????
    :great:Semper FI

    2008 Vortec 6.0 LT Z-71
    2500 HD "BIG BOY" Truck
    Stealth Grey Metallic
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    265 75 R16 Michelin LTX M/S2 ORWl
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  2. #2


    I would not think so if you go with that big of a exhaust you would most likely have to put a custom tune on your truck to make up for the loss of back pressure. Then you may get better fuel mileage. I would not suggest anything over a 4 inch tip on a gas burner. Just my .02 cents. I have 3 1/2 inch tips and they sound good and look good. 5 inch tips are a lil bit over the top to me. Good luck and go with a cherry bomb xtream muffler they sound great.
    08 silverado
    K&N cai
    single in dual out cherry bomb pro
    leveling kit
    custom painted bow ties
    Bed liner
    Tinted windows
    20inch Cruser Alloy Switchblades
    Goodyear Eagle GT2 285/50/20
    1 truly heavy foot + Wait4meperformance SCT Handheld
    100 shot of Nitrous Dyno tune system
    SS front bumper
    Matching painted front grill and bow ties

  3. #3


    If your looking for MPG gain, Tunes/Programmers are probably the best way to go and will give you the biggest gains for your truck.
    2000 Chevy Silverado 1500 5.3L Z71 - 4x4

  4. #4


    my parents have an 03 6.0l and when talking to my exhaust guy about possibly putting a 3'' setup on there he said they have done it b4 and it was so loud that they ended up taking them off for the customers cause they couldnt handle it.

  5. #5


    Hey Heavy Chevy, how do the extremes compare to the super 44's. I had an Extreme on my ranger and it sounded good but obviously not as good as a v8 would
    04 Silverado
    Manik brush guard
    Readylift leveling kit
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    Pro Comp All Terrains (Winter)
    Silverstar Bulbs
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    Dick Cepek DC1's wrapped around 285 Toyo Open Countrys (Summer)
    Random chrome bling and lots of stickers
    More to Come with a bigger budget

    And a 78 Bronco for the weekends

  6. #6

    Join Date
    Feb 2008
    Red Wing, Minnesota, United States


    5" is way too big, thas more for diesel of heavily modded engines. If you just go to magnaflow or flowmaster and submit what your vehicle is they will tell you and thats as big as you should go, they do test what they build so its the right size
    99 K1500 Suburban LT "THE BEAST"
    Hypertech III, K&N, true dual

  7. #7
    Legend 2ToNe04's Avatar
    Join Date
    Apr 2009
    Fresno California
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    you should get a custom tune, cold air intake, long tube headers, and a nice muffler sound you like.

    5" would be effin loud though

    2004 4.8| Custom Paint| Tint| De-badged| Shaved Tailgate| Rollpan| Smoked Tails| Color Matched| Lowered 5/8| Suede Interior| Color Matched Interior| Indash & TVs| Mids-Lows & 2 12" CVRs| 500 & 1100 Interfires| Soundeadener| Outlaw CAI| Magnaflow|
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