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#gmc #help #obsbuild 1500 1992 1995 1998 2003 2005 2006 350 4.8l 454 4l60e 4l80e 4wd 4x4 5.3 5.3l 5.3silverado 5.7 5.7 tbi 5.7 vortec 5.7vortec a/c alternator avalanche battery c10 c1500 catalytic converter chevrolet chevrolet silverado chevy chevy c/k chevy c/k1500 chevy c/k2500 chevy help crank no start differential duramax electrical electrical issue engine engine swap exhaust fuel fuel pump gmc gmc sierra gmt400 headlight headlights heater help interior k1500 lift lift kit lifted low oil pressure lq4 ls swap misfire need help noise obs chevy overheating p0300 quadrasteer radiator radio rough idle seats shocks sierra sierra 1500 silverado silverado 1500 silverado 2500 hd silverado1500 suburban suspension swap tahoe tbi tires trail boss transfer case transfer case shift motor transmission transmission issue truck vortec wheels wiring wiring isues yukon yukon xl z71
  1. Chevy Silverado Forum (GMC Sierra)
    My 2003 5.3 Silverado has no cats and a thrush welded muffler. Recently I had to drive a long distance so I replaced the Thrush with a stock muffler. After the trip, I put the Thrush back on, and the drone is much louder and a lot less bearable than before I reverted to stock. The only...
    4l60e catalytic exhaust flowmaster vortec
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