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Flowmaster 70 Series Big Block II Mufflers

48 Reviews
$199.00 - $210.00
List Price
$178.95 - $188.95
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Flowmaster 70 Series Big Block II Mufflers

Center Inlet / Center Outlet

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$199.00
List Price
$178.95
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    Center Inlet / Dual Outlet

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    $199.00
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    $178.95
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      Center Inlet / Offset Outlet

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      $199.00 - $210.00
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      $178.95 - $188.95
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        Dual Inlet / Center Outlet

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        $199.00
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        $178.95
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          Offset Inlet / Center Outlet

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          $199.00
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          $178.95
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            Offset Inlet / Opposite Side Offset Outlet

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            $199.00
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            $178.95
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              Related Products

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                Features:
                Features:
                • The Flowmaster 70 Series Big Block II Muffler is specially-made for big trucks, SUVs, RVs and any other towing vehicle
                • Accommodates maximum exhaust volume for handling huge engines at maximum load
                • Provides outstanding boosts to power and torque to towing excellence
                • Adds a throaty mild exhaust tone to your vehicle without overpowering volume
                • Utilizes Flowmaster's exclusive Delta Flow technology for superior scavenging and minimal interior resonance
                • Crafted from aluminized steel for corrosion resistance and precision mig welded for maximum durability
                • Casing embossed with the Flowmaster name
                • Fits vehicles that do not match the 50 Series Big Block Muffler
                • Your Flowmaster 70 Series Big Block II Muffler carries a 3-year warranty
                Description:

                Maximum flow volume, maximum efficiency, maximum power. The Flowmaster 70 Series Big Block II Muffler does it all for your big, bad truck, SUV, RV or other towing vehicle. With its massive chamber, the Flowmaster 70 Series handles the output of huge working engines at their highest load, boosting torque right when you need it.

                The Flowmaster 70 Series Muffler also uses exclusive Delta Flow technology for the least possible interior resonance, thanks to precision deflectors in the chamber. These exact parts also aide exhaust gas scavenging for scraping together the most power and torque possible.

                The 70 Series Big Block II 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 70 Series Big Block II Muffler boasts a 3-year warranty.

                Notes:
                • Flowmaster 70 Series Big Block II Mufflers come in a variety of inlet/outlet configurations and sizes, shown above. Select the inlet/outlet diameter you need from the dropdown menus above.
                • ATTN: State of California Consumers
                  warning symbolWARNING: This product can expose you to chemicals including nickel (metallic) and chromium (hexavalent compounds) which are known to the State of California to cause cancer and birth defects, or other reproductive harm (For more information go to www.p65warnings.ca.gov)
                Average Rating
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                Quality
                48 Customer Reviews
                5 Star
                30 (63%)
                4 Star
                13 (27%)
                3 Star
                3 (6%)
                2 Star
                1 (2%)
                1 Star
                1 (2%)

                Flowmaster 70- 2014 GMC Sierra

                These mufflers are perfect. Not to loud or crazy drone. Quiet while cruising and moderate roar when you open up the throttle.
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                Posted By Ruben G (WESLACO, TX) / May 13, 2019
                2014 GMC Sierra
                Yes
                No

                +Dual exaust on my 2017 Silverado

                Installed new Flowmaster 70 series muffler on my truck with dual exhaust pipes coming out the rear of truck. Truck sounds great just the tone that I wanted.
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                Posted By Ronald C (Denison, TX) / October 31, 2017
                2017 Chevy Silverado
                Yes
                No

                2015 Ford F-150 5.0

                THE MUFFLER HAS A SLIGHT RUMBLE, WHICH IS WHAT I WANTED. I PLACED MY ORDER BY PHONE TO MAKE SURE I GOT THE RIGHT ONE. I ORDERED THE ONE WHICH WAS OFFSET. I TOOK IT TO THE LOCAL MUFFLER SHOP TO HAVE IT INSTALLED. THEY SAID IT DIDN'T LINE UP AND HAD TO MAKE A CUSTOM "S" PIPE TO MAKE IT WORK, COST ME AN EXTRA $50.
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                Posted By patrick m (BALLWIN, MO) / October 4, 2017
                2015 Ford F-150
                Yes
                No

                Flowmaster 70 series big block

                Overall, I am happy with the muffler. As my daily driver and primary family vehicle used for traveling, I didn't want anything too loud. This muffler is a little louder than what I expected, comparing to a 50 series installed on same truck. I removed the 50 series last year and had to go back with the factory muffler due to a drone when pulling my trailer or boat. Using Flowmaster's sound chart, I thought the 70 series would be only choice as it looked to be the quietest muffler Flowmaster makes
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                Posted By Chad H (Lake Charles, LA) / March 29, 2017
                2013 GMC Sierra
                Yes
                No

                Flow master 70 series

                I purchased this muffler to replace a smaller flowmaster muffler that was too loud for my application. This has the performance of the flowmaster technology without all the noise.
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                Posted By Jeffrey S (Warsaw, MO) / November 10, 2016
                2008 GMC Sierra
                Yes
                No

                Life Time

                I was excited about installing this muffler and expected it to be real quiet better than the origional equipment well not so I still needed the resinators. I wish I was told I would need something to keep the drone noise out of the cabin. There are a lot of V/^ engines out there and more testing should be done to eliminate the drone noise and still have better flow.
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                Posted By Glenn S (Waupaca , WI ) / June 15, 2016
                2015 GMC Acadia
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                No

                Flowmaster 70

                I am very satisfied with the Flowmaster 70 lock monster. Great sound installation very easy would recommend this type of muffin to anyone who owns a Ford pick up our SUV vehicle. Makes my Ford sport Trac sound like a very high performance vehicle.
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                Posted By michael t (NATIONAL CITY, CA) / May 27, 2016
                Yes
                No

                Flowmaster 70 Muffler

                Product was purchased to provide maximum flow for my '95 Chevy C1500, 4.3L V6. Before my purchase I contacted Flowmaster before purchasing for their recommended muffler and the 70 Series was recommended because I also wanted the quietest muffler possible. I had a whole new exhaust system installed including a new Flowmaster Universal Cat and the muffler was placed just ahead of the rear axle as recommended. While it met my expectations for increased flow, the drone in the cab was a surprise.
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                Posted By c r w (DANVILLE, IN) / March 24, 2016
                1995 Chevy C/K 1500
                Yes
                No

                70 series big block

                the sound is the best of 3 different mufflers ive had tried on my 2015 v6 canyon. Other mufflers had ricey tin can sounds especially on hard acceleration and I know I wont get the v8 sound. This one is deep and mellow but still know u have an exhaust, hardly any drone. Happy with purchase so far.
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                Posted By Andrew G (West Seneca , NY ) / March 20, 2016
                2017 GMC Canyon
                Yes
                No

                14 ram

                its important how your truck sounds. For an older guy this flowmaster 70 was perfect for me. had compliments of the sound. went from single to two. flowmaster 13 inch tips looks good.Raised in the 70s know what that sound should be.Thanks autoanything
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                Posted By Mike B (Blanchester, OH) / October 17, 2015
                2014 Dodge Ram
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                Very nice!

                Exactly what I needed to quiet my truck down. Works very well and still has a little bit of a deep tone to the exhaust.
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                Posted By Derek C (GREAT FALLS, MT) / June 3, 2015
                2016 GMC Canyon
                Yes
                No

                Not what I was expecting!

                Was told what I thought was what I wanted. A deep sound. My stock muffler almost sounds the same. But power wise yout will get from the 70 series. For the money I paid I'm not very happy with the results.
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                Posted By Jason B (Shellsburg, IA) / April 30, 2015
                Yes
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                Truck guy

                Great sound just what I was looking for great price . A+
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                Posted By Floyd T (STONE RIDGE, NY) / October 11, 2014
                Yes
                No

                flowmaster 70

                product exactly as expected
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                Posted By AJ S (COLUMBIA, MO) / September 9, 2014
                2012 GMC Sierra
                Yes
                No

                Sounds great

                Had a Banks Monster Exhaust on the truck. Excellent exhaust system but too loud when pulling travel trailer. Was able to use existing Banks pipes with this Flowmaster muffler. Toned down quite a bit but still sounds great. Gas mileage improved from 13 mpg average to 14.5 mpg average. Probably due to increase in back pressure. Hammering sound with Banks muffler is gone. Runs much smoother.
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                Posted By Dennis M (TELFORD, PA) / August 29, 2014
                2006 Nissan Titan
                Yes
                No

                Not an easy install for the DIYer

                Despite what the description and the Auto Anything chat will tell you, there are modifications that need to be done at a shop in order to install this muffler on a 2014 F-150.
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                Posted By Aaron H (MURPHY, TX) / August 23, 2014
                2014 Ford F-150
                Yes
                No

                Great Mufflers

                We had to get these for our big truck cause we just got a 5th wheel and the 50 series were too loud on the truck. We think these are much quieter.
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                Posted By Nicole L (Ramah, CO) / August 16, 2014
                2002 Chevy Silverado
                Yes
                No

                Just what I wanted

                Almost stock sound, but gives you that flowmaster growl when you step down on the gas. Yje only down side is that it is really heavy, 40lbs. Other than that I'll give it 5 stars.
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                Posted By joo y c (HACKENSACK, NJ) / July 11, 2013
                2002 Honda Odyssey
                Yes
                No

                Flowmaster 70 Series Big Block II Muffler gas mileage increase

                I had the Flowmaster 70 Series Big Block II Muffler put on my 2004 Chevy Tahoe in hopes of better gas mileage. After two tanks of gas I am presently totally disappointed. My mileage went from 17mpg to 13mpg. Presently I would not recommend this product to anyone.
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                Posted By Jamie E (yucaipa, CA) / March 21, 2013
                2004 Chevy Tahoe
                Yes
                No

                Just the right sound! Not too loud; not too quite.

                The perfect size to replace the original muffler. The installation required some minor modifications just as noted in the product description. The 2.5 inch diameter is about an 1/8th of an inch too big for the stock exhaust pipe; but I resolved by cutting slits along the length of the the inlet and outlet pipes. This allowed the clamps to compress around the smaller exhaust pipe. Also had my mechanic weld the joints after installation. Very happy with the overall experience!
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                Posted By Gregg M (Mt Airy, NC) / February 7, 2013
                1998 Toyota 4Runner
                Yes
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                05 4runner/nice

                On the recommendation of my muffler guy went with super 70,had a delta 50 on my tacoma too ricey w/o resonator hence the 70, nice & throaty but doesn't overpower ya on the road , you know its there but kinda sounds like v8 suv !
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                Posted By mw d (Las Vegas, NV) / February 28, 2012
                2011 Toyota 4Runner
                Yes
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                Flowmaster 70 Series Big Block II Muffler

                Great sounding performance muffler that isn't too loud ! Just the right amount of bark.
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                Posted By Ron B (Stephenson, MI) / January 25, 2012
                2000 Chevy C/K 2500
                Yes
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                2010 Ford F150 SuperCrew

                Sounds just right for me. Not too much rumble, just enough. You can hear it on the highway. I wouldn't recommend it if you go long distances. I had it installed for $60.00.
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                Posted By Michael B (Allen, TX) / August 22, 2011
                2010 Ford F-150
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                great product

                very happy with my purchese
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                Posted By Jarek H (Knoxville, TN) / May 2, 2011
                2001 GMC C/K 1500
                Yes
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                94 Winnebago

                love the power we gained.
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                Posted By Richard D (Campbellsport, WI) / November 16, 2010
                Yes
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