muffler delete

  1. 1

    Muffler delete

    Ok guys I done a muffler delete and I cleaned the intake 2 weeks ago. Now the problem is I'm constantly getting a P0420 code I checked everything no leaks in exhaust or anything. So I scheduled an appointment at the dealer just wondering if they will try to say the muffler delete caused it...
  2. H

    Hulknasty's nnbs vortec max

    Well decided it was time to pick up a another truck. Ended up getting a black 2007.5 6.0 vortec max crew silverado ltz. Mods so Far: 2011 ltz split grille air aid mit intake tube K&N drop in Filter Cleared headlights LED turn signals 2.5 tgc level Antenna relocated billet bowtie...
    • hulknasty
    • Thread
    • 2007 auto awesome black cam change engine filter fortplainman led ltz muffler delete nbs nnbs paint post red silverado stock tails tires truck tune wheels z71
    • Replies: 143
    • Forum: Under Construction
  3. BigBen

    muffler delete nnbs 2013/any problems?

    Ive been woundering if taking off my muffler on my nnbs would have negative effects on my gas economy? Is there a major loss of back pressure? If you have done it how badass does it sound lawlz
    • BigBen
    • Thread
    • 2013 awesome ginger muffler delete nbs nnbs replace silverado strait pipe trolling
    • Replies: 16
    • Forum: Performance
Top Bottom