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  1. #1

    Default Flowmaster 40 dual exit; still not loud enough!

    I recently had a single 3" in, dual 2" out Flowmaster 40 series put on my 03 Silverado. It has a good rumble at idle and through the rpm range but I want it to be louder. The guy who did my exhaust only used about 6 inches of the 3" pipe going into the muffler because he said he couldn't bend the 3" pipe over the frame tube that runs across the chasis. What are other options to make it louder without making check engine light come on because of the O2 sensors?


    03 Silverado Z71 - Rough Country 2-1/2" Leveling kit, Bilstein 5100 series shocks, 33x12.50 Nitto Mud Grapplers , '06 17" Silverado rims, K&N 57 series CAI, Color matched bow tie, KC 57 series Hi-Lights mounted in grille, Pioneer 7" Double Din with iPod hookup, Cobra CB, Wilson 1000 antenna, billet grille, T-bar crank, removed side moldings, Bose

  2. #2


    Straight pipe after the cats?
    2000 Chevy Silverado 1500 5.3L Z71 - 4x4

  3. #3


    or glass packs

  4. #4


    Quote Originally Posted by 5speedsilverado View Post
    or glass packs
    no I don't really want to do glass placks.

  5. #5


    im lookin at a super 44 for mine dont know it that would help you or not

  6. #6


    True dual no muffler's will not set off any o2 sensors. I had it on my old truck and it sounded awesome but its really loud, and really raps.
    2000 Silverado, 3" body lift with 2" rear block in rear and torsion bars cranked up front. Westin bull bar, 35" Mickey Thompson Baja ATZ. 2 3/4 true duals no mufflers to 4" stainless tips at 65 degree angle, smoked tailights, led lightbar, black halo headlights.

  7. #7


    And i've heard if you remove the cats it gets WAY louder

  8. #8


    your upstream O2 controls the A/F mxture, and will not be affected. The only purpose of the downstream O2 is to monitor the cat

  9. #9
    Legend 2ToNe04's Avatar
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    Apr 2009
    Fresno California
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    w.e u do dont mess with the cats.... i think you gotta smog in the VA no?

    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|
    Future Mods: 6.0 LQ4/9| Bags|

  10. #10

    Join Date
    Feb 2008
    Red Wing, Minnesota, United States


    Just go straight pipes
    99 K1500 Suburban LT "THE BEAST"
    Hypertech III, K&N, true dual

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