Okay, so help me out here.

Discussion in 'Chevy Silverado Forum (GMC Sierra)' started by staymad, Jan 31, 2013.

  1. staymad

    staymad New Member

    I know cutting your exhaust is illegal, but the cops in my town dont care about exhaust... anyways I cut mine off right before my muffler, I still have my Cats, I was just wondering if, by cutting them off, i have lost power, gained power, or hurt anything... thanks!
  2. j cat

    j cat Epic Member 5+ Years 1000 Posts

    depends on the vehicles age .

    the back pressure is part of the PCM programing. no/little back pressure things get messed up. MPG/POWER/RUN issues develop.

    the O2 sensors are part of the fuel management.

    older carb engines you should not have any problem.

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