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Flowmaster 40 dual exit; still not loud enough!

Discussion in 'Performance & Fuel' started by cohen, Aug 14, 2009.

  1. cohen

    cohen New Member

    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?
  2. Tdaz250

    Tdaz250 Rockstar 100 Posts

    Straight pipe after the cats?
  3. 5speedsilverado

    5speedsilverado Epic Member 5+ Years 1000 Posts

    or glass packs
  4. cohen

    cohen New Member

    no I don't really want to do glass placks.
  5. yotchie

    yotchie Rockstar 100 Posts

    im lookin at a super 44 for mine dont know it that would help you or not
  6. Tapper1823

    Tapper1823 Member

    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.
  7. Tdaz250

    Tdaz250 Rockstar 100 Posts

    And i've heard if you remove the cats it gets WAY louder
  8. nos351wcm

    nos351wcm Rockstar

    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. 2ToNe04

    2ToNe04 Epic Member 5+ Years 1000 Posts

    w.e u do dont mess with the cats.... i think you gotta smog in the VA no?
  10. vncj96

    vncj96 Epic Member 5+ Years 1000 Posts

    Just go straight pipes

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