Flowmaster Mufflers 70 Series Big Block II

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Center Inlet / Center Outlet
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Center Inlet / Dual Outlet
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Center Inlet / Offset Outlet
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Dual Inlet / Center Outlet
Ships between 09/07/2010 - 09/08/2010

Dual Inlet / Dual Outlet
Ships between 09/07/2010 - 09/08/2010

Offset Inlet / Center Outlet
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Offset Inlet / Dual Outlet
Ships between 09/07/2010 - 09/08/2010

Offset Inlet / Opposite Side Offset Outlet
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Offset Inlet / Same Side Offset Outlet
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Product InfoManufacturer InfoReturn Information

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
  • The Flowmaster 70 Series 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
  • Quality Flowmaster muffler crafting uses aluminized steel for corrosion resistance and precise mig welds 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 drop down at right.

Flowmaster Mufflers 70 Series Big Block II Customer Reviews

Average Customer Rating

   (20)
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nice sound

Posted on 08/28/2010 by Brandon H. - 2007 GMC Sierra (Gowrie,IA)

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Price/Value
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"Sounds good on 07 sierra. Not too loud just enough to know its not stock."

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About Brandon H.
Vehicle
2007 GMC Sierra
I use my vehicle for
recreation
 
A great mellow, growl and improved performance over stock

Posted on 07/11/2010 by Thomas B. - 2003 GMC Sierra (Washington,VA)

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Ease of Installation
Price/Value
Quality

"Well, a couple of years ago I purchased two Flowmasters Super 44 mufflers to go behind my two catalytic converters. These went on my 2003 GMC Sierra 1500 HD (Crew Cab with 6' short bed) 6.0L V8. I was excited since I would have true duals and the loudest mufflers that Flowmaster made. They sounded like a hot rod on the outside and the inside resonance and noise was terrible, especially around 25 mph and 75 mph (horrible roaring/annoying sound). After a year, I had to get rid of them and put my stock back on. I needed something aftermarket, but wanted a deep mellow tone with good low end power for my truck. Behold, the 70 series big block II. A great sounding muffler that lets you know you have a powerful muffler, but not annoying in the least bit. The inside resonance is not even there - a low mellow sound when you hit the gas pedal and then it disappears when you cruise at 20, 30, 40, 50, 60, you get the picture. A great muffler for the person who uses their truck, suv, etc for everyday use, work, towing, family activities, etc. If you're looking for something crazy loud, inside cab and out, go with something else (a friend told me that even the 50 series big block is a little too loud for this truck, if you looking for low and mellow). But if you're looking for a mild, good strong, a little throaty sound with increased torque and towing power, this 70 series big block II muffler is for you. Check out the reviews and videos online. Hope this review helps you out."

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About Thomas B.
Vehicle
2003 GMC Sierra
I use my vehicle for
Commuting, family activities, work - general contracting
 
The Yukon XL hums

Posted on 02/03/2010 by Joe S. - 2001 GMC Yukon XL (Boulder,CO)

3 of 3 people found the following review helpful.

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Ease of Installation
Price/Value
Quality

"Wanted to spruce of the old rig, 2001 GMC Yukon Denali XL, so asked a lot of car guys for advise. The 70 Series seemed to be the choice. The XL is the family car and not a muscle car. Autoeverything price can't be beat. Meineke did an install for $50 as it was essentially a swap. They needed to flute the pipes a bit as stock is 2 5/8 and 70 Series are 2 1/4. Dual in, dual out into a Y with a single exhaust. Experts appear split on benefits of dual exhaust, bigger sound, maybe little power boost. Dual exhaust pipes would have cost another $300 or so. Sounds great and heads turn, but inside the rumble is pleasant. A bigger sound might be great at first, but conversation in the car would suffer. Kept the factory pipes, single outlet. I love starting up the Yukon and I feel the extra power for sure. I can really feel the power on climbs. Also put in an oversized K&N airfilter."

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About Joe S.
Vehicle
2001 GMC Yukon XL
I use my vehicle for
Skiing, fishing, family
 
flowmaster 70 series 2 beast

Posted on 01/13/2010 by Joshua H. - 2009 Chevy Silverado (Pocono Summit,PA)

4 of 4 people found the following review helpful.

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Price/Value
Quality

"i have had the 3"muffler on my 09 silverado for awhile and very happy with it. It sounds great and keeps getting better. It took a tenth off my 1/4 mile with the tail pipe."

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About Joshua H.
Vehicle
2009 Chevy Silverado
 
Much Better then stock!!!

Posted on 11/19/2009 by Poria A. - 2007 Toyota Tundra (Houston,TX)

6 of 6 people found the following review helpful.

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Price/Value
Quality

"I bought the FM 70 series big block 2 bc it was the only one that would fit my stock pipes. I doubted the muffler at first because i heard its not a big sound but when i had it installed it made a aggressive sound. Not too much but enough to hear a good rumble when you accelerate. I would recommend this to people who want a more of a rumble but enough to give you a headache"

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About Poria A.
Vehicle
2007 Toyota Tundra
I use my vehicle for
Everday use
 
Quiet yet still sounds good

Posted on 10/10/2009 by Timothy M. - 2009 Dodge Ram (Corpus Christi,TX)

0 of 3 people found the following review helpful.

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Ease of Installation
Price/Value
Quality

"This muffler I think would be better suited for a larger engine. My HEMI on my new Ram doesn't give it the echoey sound I hear on other Flowmasters. Going to order a 50HD series soon"

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About Timothy M.
Vehicle
2009 Dodge Ram
I use my vehicle for
Everything
 
Paul in Sherwood, OR

Posted on 10/14/2008 by Paul G. - 2002 Chevy Express (Sherwood,OR)

5 of 5 people found the following review helpful.

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Ease of Installation
Price/Value
Quality

"The tech support rep recommended this muffler for my one ton Chevy Van. It was a perfect fit, the muffler shop I chose had no trouble installing it. They made a new full 3" tailpipe to match the muffler output. It's nice to be able to hear the engine running now, the noise inside is audible but not too loud. The sound outside is best described as muscular & throaty. Great sound. It is too early to tell if my gas mileage has improved or how it performs pulling my RV trailer. I also added a K&N air filter."

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About Paul G.
Vehicle
2002 Chevy Express
I use my vehicle for
Business, recreation, prime mover for toys.
 
Sound level & Flow (fuel milage)

Posted on 09/17/2008 by Steve M. (Lake Havasu City,AZ)

7 of 7 people found the following review helpful.

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Ease of Installation
Price/Value
Quality

"Having a older Suburban!!fuel mileage is not the best... I chose a 70 series Flowmaster to recoupe some milage!! It's to early to tell about the milage but the sound is just what I was looking for!! a little throaty but not loud (my wife hasn't noticed the difference in the sound yet) that's a good thing... I'm sour this will fit my needs."

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About Steve M.
I use my vehicle for
Travel,Family Activities..
 
Flowmaster Mufflers 70 Series Big Block II

Posted on 04/15/2008 by Wayne S. - 2001 Dodge Durango (Bronx,NY)

9 of 11 people found the following review helpful.

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Price/Value
Quality

"i love my flowmaster nice sound when i stomp on the go pedal quiet at idle its my second one"

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About Wayne S.
Vehicle
2001 Dodge Durango
I use my vehicle for
commuting
 
Great sound

Posted on 04/14/2008 by Steven E. - 2005 Chevy Silverado (Buckeye,AZ)

15 of 15 people found the following review helpful.

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Ease of Installation
Price/Value
Quality

"I have a 2005 chevy 4x4 2500hd. Had 40 series and hated them I'm 52 years old and they were too loud. The 70 series are great good deep sound and not so loud."

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About Steven E.
Vehicle
2005 Chevy Silverado
I use my vehicle for
Every day use.
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