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Flowmaster 50 Series Big Block Mufflers

18 Reviews
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$234.99 - $261.99
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Flowmaster 50 Series Big Block Mufflers

Dual Inlet / Dual Outlet

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$259.99 - $260.99
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    Dual Inlet / Opposite Offset Outlet

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    $261.99
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      Offset Inlet / Opposite Side Offset Outlet

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      $234.99
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        Product Info
        Features:
        • The Flowmaster 50 Series Big Block Muffler cranks-out extra power and torque for powerful trucks, SUVs and RVs—especially when towing
        • Sounds a more mild version of the famous Flowmaster tone for revealing your engine power without waking the neighbors
        • Drops under-hood temperatures as much as 200°F, extending engine life
        • Unique H-chamber design reduces interior resonance for a smooth, calm ride inside your cab
        • Large chamber capacity handles your engine's power under heavy loads
        • Increased engine efficiency delivers a critical boost in gas mileage
        • Crafted from aluminized steel for corrosion resistance and precision mig welded for maximum durability
        • Your Flowmaster 50 Series Big Block Muffler boasts a 3-year warranty
        Description:

        Increased power, torque and mileage are vital for today's trucks, SUVs and RVs. That's why Flowmaster makes a 50 Series Big Block Muffler that cranks-out extra force at the pedal for towing. Plus, the efficiency of the Flowmaster 50 series Big Block reduces under-hood temperatures, lengthening the life of critical engine components.

        Don't forget the famous Flowmaster sound you get with the 50 Series Big Block Muffler. It's a milder tone-quieter than the 40 Series-but with plenty of the famous Flowmaster roar. Interior resonance is greatly reduced by the large H-chamber design, which not only makes for a calmer cab but also handles your big engine under heavy loads.

        The 50 Series Big Block Muffler boasts the quality construction you'd expect from Flowmaster. Each Flowmaster Muffler is built with 16-gauge aluminized steel for corrosion resistance and fully mig-welded for maximum durability. Best yet, your Flowmaster 50 Series Big Block Muffler boasts a 3-year warranty.

        Notes:
        • Flowmaster 50 Series Big Block Mufflers come in a variety of inlet/outlet configurations and sizes, shown above. Select the inlet/outlet diameter you need from the drop down at right.
        Manufacturer Info
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        Customer Reviews

        Average Rating
        Appearance
        Ease of Installation
        Price/Value
        Quality
        18 Customer Reviews
        5 Star
        14 (78%)
        4 Star
        4 (22%)
        3 Star
        0 (0%)
        2 Star
        0 (0%)
        1 Star
        0 (0%)

        It's quiet, but robs power

        . Certainly made the exhaust quiet, the engine makes most the noise now. Doesn't really have a "tone" over stock muffler. About the same as I can tell. I had the stock 3.5" with a test pipe on it and edge juice. You touch the throttle and it was taking off. This muffler is HUGELY restrictive compared to a test pipe or even straight through 4". Really have to step on it to get it to move now. To do again, I'd buy a 4" system w/muffler and be done with it.
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        Posted By Jesse A (NORTON, VA) / July 11, 2019
        2004 GMC Sierra
        Yes
        No

        Noise

        Too off loud 50 series cause drone was so bad , this one is great to bad not stainless.
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        Posted By William L (Canandaigua, NY) / July 25, 2017
        2015 Chevy Silverado
        Yes
        No

        2017 Silverado 6.2L Muffler Swap

        So happy with the new sound and so is the wife. You most def can hear it - but never is it obnoxious - not even at WOT. Just a nice mellow tone from idle to 75mph and no drone - no chopper sound - Deleted flapper. No difference in V4 around town or on the highway.... One big plus - now I can hear it shift - which helps feel it shift - before I hardly knew when it shifted. . Towed up a long grade - no drone - just a nice throaty sound even working it.... Cold & warm starts sound great!
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        Posted By RICKY H (SUMNER, WA) / May 2, 2017
        2017 Chevy Silverado
        Yes
        No

        orange crush

        I love the big block flow master muffler. it sounds great more flow. it was one of my best purchases. Go flow master the best !!!!!!
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        Posted By Kemuel J (Aurora, CO) / August 31, 2014
        2002 Chevy Avalanche
        Yes
        No

        Flowmaster for '05 Silverado

        Exactly the tone I wanted and not overly loud. Wanted to also reduce back pressure and perhaps improve mileage; have not yet been able to confirm that. The muffler fit well with the included length of pipe and looked strong and durable.
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        Posted By Roland R (North Las Vegas, NV) / June 19, 2013
        2005 Chevy Silverado
        Yes
        No

        Truck muffler

        Just like you described. No complaints.
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        Posted By Douglas H (miamisburg, OH) / April 11, 2013
        2012 GMC Sierra
        Yes
        No

        great muffler

        I picked up more power and mpgs. Great buy and simple install.
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        Posted By Stephen M (Syracuse , NY ) / June 21, 2012
        2011 Chevy Silverado
        Yes
        No

        2011 Chevy 2500 6.0l

        Piece of cake install, even for a home mechanic. Only had to make 2 cuts to remove factory muffller and slipped new flowmaster rite into place. Sounds sweet.......
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        Posted By Matthew L (Olathe, KS) / January 12, 2012
        2011 Chevy Silverado
        Yes
        No

        Great sound

        Easy to install. Had it installed in less than a hour. Sound is great. Very subtle. NO resonance. If anything it could of been a touch louder but the vehicle is used as a family people mover. Overall very satisfied.
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        Posted By Jason C (Foley, AL) / April 26, 2011
        Yes
        No

        Just Awesome

        I have the Spectre air intake system, and the Airaid throttle body spacer installed on 1999 Silverado 5.3L. I just thought I was getting the full advantage from them, that was until I installed this Muffler. It really opened things up, faster throttle response, and better high RPM performance. It sounds great, nice deep tone, and not so loud you have to worry about getting pulled over. This is a must have for anybody looking to really get the most out of there Engine. Best of all it took only about 1.5Hrs. to install. Weld right up with no extension pipes, on 1999-2002 Chevy Silverados.
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        Posted By dustin t (Elkins, AR) / March 11, 2011
        1999 Chevy Silverado
        Yes
        No

        Installed on 2003 GMC 2500HD 6.0

        I installed this muffler on my truck. The only other engine mods I have on is a Spectre CAI. I highly advise getting it welded, as the clamps just couldn't secure the muffler properly. The shop charged me $150 to weld it- a ripoff, but it's worth it. Flowmaster says that the GM 6.0 is the hardest motor to quiet down, so I advise getting this muffler. According to Flowmaster, this is the biggest, quietest muffler they produce. The sound is great. Very powerful, not too loud, either. There is a noticeable drone at around 2000 rpm, but I got used to it fast. It sounds great on the inside, and even better on the outside. I did certainly feel a power boost all across the rpm band, but no improvement in mpg's. And as usual, AutoAnything was terrific.
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        Posted By Jonathan V (Saint Paul, MN) / March 2, 2011
        2003 GMC C/K 2500
        Yes
        No

        50 Series Flowmaster Dual In & Single Out

        Sound was Great and 1 MPG increase in mileage. Muffler attachment did match exhaust pipe. A little fabrication required but well worth it. Very Happy with purchase!
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        Posted By Dale J F (Cheyenne, WY) / December 25, 2010
        2005 Cadillac Escalade
        Yes
        No

        Titan Power & Sound

        This muffler is exactly what I expected and exactly as advertised. It has a very mellow sound and yet the inside cab of the truck is much quieter than the Volant series I had on before. I used the 3 inch in and 3 inch out to a single tail pipe to maintain departure angle for off-roading. Recommend this product and this retailer. Quick delivery.
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        Posted By Lawrence B (Weaverville, CA) / December 15, 2009
        2005 Nissan Titan
        Yes
        No

        2008 Tundra Giddy-Up

        Perfect rumble, not irritating. I think this would be the answer for anyone wanting to keep the sound close to stock until you get on it then the gates of hell open up :-0
        Posted By Royston J (Fort Worth, TX) / February 12, 2008
        2008 Toyota Tundra
        Yes
        No

        Great Flowmaster

        Put this on my 05 Yukon Denali 6.0. Having driven street cars in the past, I thought it could be louder at Idle, but it does sound great when you get on it and there is NO inside drone while cruising. I drove it in downtown Chicago not long ago and the sound from the muffler bouncing between the building was sweet. All in all I am happy.
        Posted By Adam H (Saint Charles, MO) / March 28, 2007
        1998 Chrysler Sebring
        Yes
        No

        Sounds good

        Flowmaster sounds good on Nissan Titan--only problem inlets and outlets were both dented.
        Posted By Justin O (Du Bois , PA ) / February 10, 2007
        2006 Nissan Titan
        Yes
        No

        feed back on the flowmaster 50 big block

        great product my truck sounds tuff
        Posted By jason w (Texas City, TX) / February 10, 2007
        2005 GMC C/K 2500
        Yes
        No

        Great product

        As always very pleased, makes my 8.1 sound good, and got the power i wanted.
        Posted By Michael A (Gravette, AR) / October 14, 2006
        2014 Chevy Silverado
        Yes
        No