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  1. #1
    Jr. Apprentice
    Join Date
    Mar 2010
    Lethbridge, Alberta, Canada

    Cool Exhaust ideas for 2003 GMC Sierra - Dual Exhaust

    i have a 2003 gmc sierra 1500 5.3L 4X4 and i am looking to put on a dual exhaust of some sort, i want there to be a slight rumble to it when idling and a good clean roar when taking off and the idling rumble when cruising or as close to that as i can get.... im not sure what pipe sizes or muffler brand and series would be best. i was thinking maybe 2 or 2 1/2 piping with magnaflow 40 series mufflers and 3 inch tips but i am open to all suggestions, please speak your thoughts any help would be appreciated. Thank you
    Last edited by RyGuyGMC; 03-16-2010 at 02:56 AM. Reason: made a mistake and realized it wasnt what i wanted

  2. #2


    Just put a Flowmaster American Thunder cat back on my 06 Sierra. 2.5" pipes with Super 44 muffler and 3" polished tips. It sounds great at idle and under acceleration but surprisingly, very little drone while cruising. Cost about 350 bucks and easy to install in driveway. I'm very happy with it!
    2006 GMC Sierra 1500 SLE X-cab Z-71
    Silver Birch Metallic, Line-X bedliner, Flowmaster American Thunder Cat-back, iPod integration kit, more to come soon!

    2006 Dodge Charger Daytona R/T
    Go ManGo!, SRT-8 hood, 20" Sport Muscle BHP Anthracite wheels, Mopar iPod integration kit


  3. #3
    Jr. Mechanic catbert's Avatar
    Join Date
    Sep 2008
    Tobacco Road, NC


    I put on a dual outlet stainless steel Magnaflow and ran the pipes straight out the back of the truck, The sound is better than any cat-back system I've ever had. I didn't run larger than stock pipes.
    Don't think Meat - Throw the ball...Crash Davis

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