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Flowmaster Exhaust Systems Part #817666 Customer Reviews

Average Rating

19 Customer Reviews

Flowmaster Force II for 2014 GMC Sierra 1500 5.3L

Reviewed by Daniel S (BOURBON, MO) Reviewed for a 2014 GMC Sierra — Mar 13, 2018 8:43 PM

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This is a great sounding Cat Back exhaust. I didn't want it to be real loud and this was a perfect choice. Has a nice throaty sound when started and I haven't noticed any drone. Was very easy to install, took about an hour. Was delivered very fast and in good condition. Highly recommend this system and was very helpful with this purchase!

Force II

Reviewed by TIM D (YANKTON, SD) Reviewed for a 2016 Chevy Silverado — Jul 23, 2017 5:34 PM

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plenty of rumble, good quality. Some drone when in V4 but not too bad. Sounds good, looks good.


Reviewed by Ivan C (Houston, TX) Reviewed for a 2016 GMC Sierra — May 16, 2017 8:59 PM

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Awesome exhaust! Just wished the clamps would work a little better. They're a little lose, had to use different ones then weld it for better attachment.

Z71 GMC 4x4

Reviewed by Roel C (Mission, TX) Reviewed for a 2015 GMC Sierra — Jan 30, 2017 8:14 PM

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Easy instructions, can follow from step to step. Being the first time to attempt this projecf on my own, I killed it, two easy hours and done. Great sound from the super 50 and the chrome tips were the bomb. But do you get some much growl outside but maintain a quiet interior. FLOMASTER RULES

Excellant sound

Reviewed by Karla F (COLUMBIA FALLS, MT) Reviewed for a 2016 Chevy Silverado — Oct 29, 2016 7:35 PM

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I bought a new 2016 Silverado ltz with 5.3 It sound like a dog. With my new flowmaster exhaust it sounds great Like a little power !!

pretty good system over all

Reviewed by matt c (Oswego, NY) Reviewed for a 2016 GMC Sierra — Jul 26, 2016 9:08 AM

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The fit is pretty good, although looking from the rear, I could not get the pipes perfectly symmetrical, no matter how hard I tried. Just a slightly different angle from one side to the other. Pretty nitpicky, but that's how I am. Other than that, the system's installation was pretty simple and straight forward. Over 700 dollars I felt was a little expensive, but I guess that' what it is these days. If it lasts as long as the stock system do, I wont complain, but if it rots out in 3 years.....

Decent for a drone-master

Reviewed by corey t (BOZRAH, CT) Reviewed for a 2014 Chevy Silverado — Apr 27, 2016 9:42 PM

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I was weary about purchasing this setup but with 15% off I figured I'd give it a shot. I didn't want a real annoyingly loud exhaust going on my 45,000 dollar truck but wanted duals and a little sound too. The exhaust does drone a little bit at 1700-1800 rpm which unfortunately is the rpm I am at on the highway. The exhaust tip bolts stripped out well before they even started tightening down onto the tailpipes. Other than that the quality seems good. I'll admit I'm happy with it overall though.


Reviewed by Charles F (LOUISVILLE, KY) Reviewed for a 2015 Chevy Silverado — Mar 28, 2016 3:19 AM

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The only trouble I had was that a couple of the connections did not want to tighten up real good.

Flow master force 2 cat back exhaust

Reviewed by Russell F (Airmont, NY) Reviewed for a 2015 Chevy Silverado — Mar 26, 2016 6:49 AM

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Drive my new 2015 Chevy Silverado rally edition 28000 miles a year so I didn't want anything too loud. Force 2 worked perfectly Mild rumble . Used exhaust in combination w/ K&N cold air induction. Close to 30 additional hp. Cost me $250 for my mechanic to install. Very satisfied

Nice Sound and Looks

Reviewed by Mike C (Lutz, FL) Reviewed for a 2016 Chevy Silverado — Mar 16, 2016 10:16 AM

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Purchase Flowmaster Cat & worked w/Mike. Mike very helpful & answered all ?'s. Rec'd on time & $ was correct. Install wasn't hard, but 2 problems. 1 clamps have center spacer that is not movable even w/spraying wd40 & using wrenches & air tools. We had to use hammer to move every single one! 2 chrome tips I know should be a tight fit, but we had to use hammer & lube to get them on end pipes. Nut/bolts to tighten at tips where useless, had to use own to finish. Sounds Great!!

Flowmaster Exhaust Systems - 817666

Cat Back Exhaust - Force II Series
  • $800.33
  • Free Shipping
  • Ships Between 7/20 - 7/24
  • What Do You Drive?


  • Style:
    Dual Rear or Side Exit (409 Stainless)
  • Material:
    With Dual Exhaust Tips
  • Part #:
  • Main piping diameter: 2.5"
  • Super 50 Series Muffler
  • Includes dual 3.5" exhaust tips
  • Includes exit pipes for dual rear or dual side exit
  • Download installation instructions (PDF)

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