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Flowmaster

Flowmaster 717787 FlowFX Cat-Back Exhaust Kit Dual 2.5 Inch Stainless Steel 4 Inch Black Ceramic Tips Compatible with 2014-2019 Classic Body Chevy Silverado GMC Sierra 1500 Crew Double Cab 4.3L 5.3L

  • Based on 130 reviews
Condition: New
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$718.95 Why this price?
Holiday Deal · 5% off was $759.95

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This item's return window has been extended for the holiday season: Returnable until Jan 31, 2026

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Availability: 17 left in stock
Fulfilled by Amazon
Arrives Thursday, Jan 8
Order within 9 hours and 42 minutes
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Features

  • Includes all Clamps, Hangers and Necessary Hardware
  • FlowFX "Straight-through" Performance Muffler
  • Large 4.00-inch Black Ceramic Coated Tips
  • Dyno-Tuned For Maximum Performance
  • Stainless Steel Mandrel Bent Tubing

Description

Flow master 717787 Cat-Back 409S - Flow Kit - DOSS - Moderate or Aggressive Sound - 14-18 GM 1500 Series Exhaust System Kit Cat-Back 409S - Flow Kit - DOSS - Moderate or Aggressive Sound Dyno-Tuned For Maximum Performance. Stainless Steel Mandrel Bent Tubing. Moderate or Aggressive Sound. Easy Installation.

Brand: Flowmaster


Vehicle Service Type: Car


Global Trade Identification Number: 08


Assembly Required: No


OEM Part Number: 717787


Brand: ‎Flowmaster


Vehicle Service Type: ‎Car


Global Trade Identification Number: ‎08


Assembly Required: ‎No


OEM Part Number: ‎717787


Manufacturer: ‎Flowmaster


UPC: ‎700042038008


Model: ‎717787


Item Weight: ‎41.6 pounds


Product Dimensions: ‎40.5 x 20.5 x 10 inches


Item model number: ‎717787


Exterior: ‎Painted


Manufacturer Part Number: ‎717787


Date First Available: July 13, 2018


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Thursday, Jan 8

Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.

To initiate a return, please visit our Returns Center.

View our full returns policy here.

  • Klarna Financing
  • Affirm Pay in 4
  • Affirm Financing
  • Afterpay Financing
  • PayTomorrow Financing
  • Financing through Apple Pay
Leasing options through Acima may also be available during checkout.

Learn more about financing & leasing here.

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Top Amazon Reviews

    • Subtle upgrade
Install was quick once the old system came off. fitment lined up well with my factory steps. As far as for noise it is louder then stock but no so loud to annoy the neighbors. Great price in my opinion as well
Reviewed in the United States on November 7, 2025 by Nigh.J.D
    • Looks and sounds GREAT!
The Flowmaster looks and sounds great on my old 2015 Chevy Silverado. Was easy to install with the help of my Father to hand me the tools I needed and Hold the Pipes in place while I tightend the clamps up. It gives the Truck some new attitude and my Milage went up 2 mpg.
Reviewed in the United States on August 25, 2025 by James Rozell Jr
    • Great exhaust. Not an easy install though.
Review Image by Joe D. Joe D.
The media could not be loaded. Sounds awesome (except during V4 mode), the gunmetal tips look awesome on a dark colored paint, especially with some running boards in front of the tips. NOT an easy install though, you do have to drill into the frame to locate and mount a new exhaust hanger, plus the front exhaust clamp will probably need to be cut off from rusting hardware (as mine was), and the factory exhaust will need to be cut in half as well to remove it. So unless you're savvy with that kind of stuff, plan for a shop install. All in all, great exhaust though. ... show more
Reviewed in the United States on October 15, 2019 by Joe D. Joe D.
    • Great sound, Good overall, Crappy hardware
I knew this would take longer to install in my driveway without a lift available, and working with a floor jack and jack stands. Once I got the old exhaust out, I found that it required some percussive maintenance to get the dual tail pipes into the muffler outlets, as the bracket was welded slightly out of alignment. Once that was done it was just a matter of aligning it all and tightening it down. As many others have mentioned, the "self tapping" screws for the rear hanger are total crap. They are softer than the frame steel, and strip the threads right off even when properly drilled. Super glue, duct tape or zip-ties would be a better choice. I just drilled the frame and put some 1/4-20 through bolts in it and it's solid. The sound is a really nice, low rumble. Not too loud at all and no silly rappy noise or resonant drone at cruise. I will have to drive it more to evaluate any perceived performance gains. I have always been happy with Flowmaster's sound. Overall, very nice, except for the crappy hardware. ... show more
Reviewed in the United States on August 16, 2022 by M. Davidson
    • Easy install great sound
Review Image by Michael Wagner Michael Wagner
Review Image by Michael Wagner Michael Wagner
The media could not be loaded. Very easy install! I did it by myself in a little over a hour with no lift.. great sound not to loud and not to quite! Perfect! I recommend getting a K&N cold air instake as well!
Reviewed in the United States on August 12, 2023 by Michael Wagner Michael Wagner
    • Horrible drone with Long Tube Headers
2015 GMC Sierra Crew Cab with Long Tube Headers. Sound is just what I was looking for at idle and driving around town. Drone is horrible at 65 mph and higher.
Reviewed in the United States on February 16, 2022 by Eric Valdes
    • Sounds great, installs fast and easy, not to loud
This exhuast installed pretty fast and easy. The only issue I had was that the self threading bolts were softer than my frame and they melted rather than thread into the holes I drilled. It was an easy fix though. I drilled the holes bigger and tapped them for 3/8" cap bolts. I love the sound, it's aggressive when on the gas but quiet at idle. I didn't want to annoy my neighbor too much in the winter while warming the truck up. Over all I'm very pleased and would install this again. ... show more
Reviewed in the United States on August 20, 2022 by Tim
    • Simple install.. perfect sound!!
This was perfect for my 2015 Silverado... I hated that it was so quite... this set up is just loud enough to let you know your driving a truck... it's not obnoxious at all...
Reviewed in the United States on July 25, 2022 by Ray

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