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Flowmaster FlowFX Cat-Back Exhaust System 717894

Flowmaster FlowFX Cat-Back Exhaust System 717894
Flowmaster FlowFX Cat-Back Exhaust System 717894Flowmaster FlowFX Cat-Back Exhaust System 717894Flowmaster FlowFX Cat-Back Exhaust System 717894Flowmaster FlowFX Cat-Back Exhaust System 717894Flowmaster FlowFX Cat-Back Exhaust System 717894
$1,354.99 ea
NEWARRIVING SOONEstimated Ship Date 08/27/2025 (If Ordered Today)38 Available from HOLLEY PERFORMANCE PRODUCTS as of 08/09/2025
Model: 4005239
Select a Vehicle or refer to the Vehicle Fitment Tab below to verify that this part fits your vehicle.
OVERSIZE 3
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[More Info]
This Flowmaster® FlowFX™ Cat-back exhaust system is designed for the 2019*-2023 GM Silverado/Sierra 1500 trucks (*new body style) with 5.3L engine and factory dual exhaust. This bolt-on system is manufactured using durable 409 stainless steel throughout and features a 3.00-inch inlet pipe leading to a single inlet/dual outlet FlowFX straight-through muffler for a deep, moderately aggressive sound and maximum performance. Maximum dyno gains of 21 hp and 26 lb.ft at the rear wheels. The dual 2.50-inch mandrel bent tailpipes are custom routed to clear the factory spare tire and tow hitch without any clearance issues and exit out through the factory exhaust bezels in the bumper, retaining the factory dual exhaust appearance. This system utilizes factory hanger locations, includes installation instructions, and all necessary hardware for an easy at home installation. Note: Fits 2WD and 4WD models.
Features:
  • Deep Powerful Tone Inside and Outside the Vehicle
  • Max Dyno Gains of 21 hp and 26 lb.ft. of Torque
  • FlowFX "Straight-through" Performance Muffler
  • Exits Through the Factory Exhaust Bezels
  • All Mandrel-bent Stainless Steel Tubing
  • Uses the Factory Hanger Locations
  • Includes All Necessary Hardware
  • Easy at Home Installation
  • Lifetime Limited Warranty
"Does not fit crew cab 2WD with 2-piece driveshaft.
Installation Notes:
"Does not fit crew cab 2WD with 2-piece driveshaft.
About Flowmaster

Manufacturer of performance exhaust systems, mufflers, performance air intakes, turbo boost modules, catalytic converters, race mufflers, headers and numerous exhaust accessories for late model cars, trucks, off-road, Jeeps, SUV’s, classic muscle cars, powersports vehicles and more. Flowmaster® gives you lots of exhaust choices with 12 designs of chambered mufflers, 3 styles of our exclusive “laminar-flow” mufflers and a new line of FlowFX “straight-through” performance mufflers, along with 5 sound categories of exhaust systems, giving you the customer, the power to custom tailor the sound of your vehicle whether you prefer mild, moderate or aggressive tones and sound levels. Since 1983, Flowmaster is the company you can trust, and has led the industry in offering only the best products you can buy for your vehicles.

Downloads:

Download Name File Size
fm_warranty_general.pdf88.58KB
717894_instructions.pdf4.5MB

Videos:

Vehicle Fitment:

The Vehicle Fitment Guide is to be used as a general reference. The data has been provided by our suppliers and manufacturers and may contain errors or incorrect data. Always refer to a professional to verify correct fitment for your vehicle.
Make Model Submodel Years Engine Fitment Notes
Chevrolet Silverado 1500 LTD High Country 2022 5.3L / 325 / V8 DOES NOT FIT TRUCKS WITH FACTORY SINGLE EXHAUST
Chevrolet Silverado 1500 LTD LT Trail Boss 2022 5.3L / 325 / V8 DOES NOT FIT TRUCKS WITH FACTORY SINGLE EXHAUST
Chevrolet Silverado 1500 LTD LTZ 2022 5.3L / 325 / V8 DOES NOT FIT TRUCKS WITH FACTORY SINGLE EXHAUST
Chevrolet Silverado 1500 LTD LT 2022 5.3L / 325 / V8 DOES NOT FIT TRUCKS WITH FACTORY SINGLE EXHAUST
Chevrolet Silverado 1500 LTD RST 2022 5.3L / 325 / V8 DOES NOT FIT TRUCKS WITH FACTORY SINGLE EXHAUST
Chevrolet Silverado 1500 LTD SSV 2022 5.3L / 325 / V8 DOES NOT FIT TRUCKS WITH FACTORY SINGLE EXHAUST
Chevrolet Silverado 1500 LTD WT 2022 5.3L / 325 / V8 DOES NOT FIT TRUCKS WITH FACTORY SINGLE EXHAUST
Chevrolet Silverado 1500 Custom Trail Boss 2019 5.3L / 325 / V8
Chevrolet Silverado 1500 Custom Trail Boss 2020 5.3L / 325 / V8
Chevrolet Silverado 1500 Custom Trail Boss 2021 5.3L / 325 / V8
Chevrolet Silverado 1500 Custom Trail Boss 2022 5.3L / 325 / V8 DOES NOT FIT TRUCKS WITH FACTORY SINGLE EXHAUST
Chevrolet Silverado 1500 Custom Trail Boss 2023 5.3L / 325 / V8 DOES NOT FIT FACTORY SINGLE EXHAUST
Chevrolet Silverado 1500 Custom 2019 5.3L / 325 / V8
Chevrolet Silverado 1500 Custom 2020 5.3L / 325 / V8
Chevrolet Silverado 1500 Custom 2021 5.3L / 325 / V8
Chevrolet Silverado 1500 Custom 2022 5.3L / 325 / V8 DOES NOT FIT TRUCKS WITH FACTORY SINGLE EXHAUST
Chevrolet Silverado 1500 High Country 2019 5.3L / 325 / V8
Chevrolet Silverado 1500 High Country 2020 5.3L / 325 / V8
Chevrolet Silverado 1500 High Country 2021 5.3L / 325 / V8
Chevrolet Silverado 1500 High Country 2022 5.3L / 325 / V8 DOES NOT FIT TRUCKS WITH FACTORY SINGLE EXHAUST
Chevrolet Silverado 1500 High Country 2023 5.3L / 325 / V8 DOES NOT FIT FACTORY SINGLE EXHAUST
Chevrolet Silverado 1500 LT Trail Boss 2019 5.3L / 325 / V8
Chevrolet Silverado 1500 LT Trail Boss 2020 5.3L / 325 / V8
Chevrolet Silverado 1500 LT Trail Boss 2021 5.3L / 325 / V8
Chevrolet Silverado 1500 LT Trail Boss 2022 5.3L / 325 / V8 DOES NOT FIT TRUCKS WITH FACTORY SINGLE EXHAUST
Chevrolet Silverado 1500 LT Trail Boss 2023 5.3L / 325 / V8 DOES NOT FIT FACTORY SINGLE EXHAUST
Chevrolet Silverado 1500 LTZ 2019 5.3L / 325 / V8
Chevrolet Silverado 1500 LTZ 2020 5.3L / 325 / V8
Chevrolet Silverado 1500 LTZ 2021 5.3L / 325 / V8
Chevrolet Silverado 1500 LTZ 2022 5.3L / 325 / V8 DOES NOT FIT TRUCKS WITH FACTORY SINGLE EXHAUST
Chevrolet Silverado 1500 LTZ 2023 5.3L / 325 / V8 DOES NOT FIT FACTORY SINGLE EXHAUST
Chevrolet Silverado 1500 LT 2019 5.3L / 325 / V8
Chevrolet Silverado 1500 LT 2020 5.3L / 325 / V8
Chevrolet Silverado 1500 LT 2021 5.3L / 325 / V8
Chevrolet Silverado 1500 LT 2022 5.3L / 325 / V8 DOES NOT FIT TRUCKS WITH FACTORY SINGLE EXHAUST
Chevrolet Silverado 1500 LT 2023 5.3L / 325 / V8 DOES NOT FIT FACTORY SINGLE EXHAUST
Chevrolet Silverado 1500 PPV 2023 5.3L / 325 / V8 DOES NOT FIT FACTORY SINGLE EXHAUST
Chevrolet Silverado 1500 RST 2019 5.3L / 325 / V8
Chevrolet Silverado 1500 RST 2020 5.3L / 325 / V8
Chevrolet Silverado 1500 RST 2021 5.3L / 325 / V8
Chevrolet Silverado 1500 RST 2022 5.3L / 325 / V8 DOES NOT FIT TRUCKS WITH FACTORY SINGLE EXHAUST
Chevrolet Silverado 1500 RST 2023 5.3L / 325 / V8 DOES NOT FIT FACTORY SINGLE EXHAUST
Chevrolet Silverado 1500 SSV 2019 5.3L / 325 / V8
Chevrolet Silverado 1500 SSV 2020 5.3L / 325 / V8
Chevrolet Silverado 1500 SSV 2021 5.3L / 325 / V8
Chevrolet Silverado 1500 WT 2019 5.3L / 325 / V8
Chevrolet Silverado 1500 WT 2020 5.3L / 325 / V8
Chevrolet Silverado 1500 WT 2021 5.3L / 325 / V8
Chevrolet Silverado 1500 WT 2022 5.3L / 325 / V8 DOES NOT FIT TRUCKS WITH FACTORY SINGLE EXHAUST
Chevrolet Silverado 1500 WT 2023 5.3L / 325 / V8 DOES NOT FIT FACTORY SINGLE EXHAUST
GMC Sierra 1500 Limited Denali 2022 5.3L / 325 / V8 DOES NOT FIT TRUCKS WITH FACTORY SINGLE EXHAUST
GMC Sierra 1500 Limited Elevation 2022 5.3L / 325 / V8 DOES NOT FIT TRUCKS WITH FACTORY SINGLE EXHAUST
GMC Sierra 1500 Limited Pro 2022 5.3L / 325 / V8 DOES NOT FIT TRUCKS WITH FACTORY SINGLE EXHAUST
GMC Sierra 1500 Limited SLE 2022 5.3L / 325 / V8 DOES NOT FIT TRUCKS WITH FACTORY SINGLE EXHAUST
GMC Sierra 1500 Limited SLT 2022 5.3L / 325 / V8 DOES NOT FIT TRUCKS WITH FACTORY SINGLE EXHAUST
GMC Sierra 1500 AT4 2019 5.3L / 325 / V8
GMC Sierra 1500 AT4 2020 5.3L / 325 / V8
GMC Sierra 1500 AT4 2021 5.3L / 325 / V8
GMC Sierra 1500 Base 2019 5.3L / 325 / V8
GMC Sierra 1500 Base 2020 5.3L / 325 / V8
GMC Sierra 1500 Base 2021 5.3L / 325 / V8
GMC Sierra 1500 Denali 2019 5.3L / 325 / V8
GMC Sierra 1500 Denali 2020 5.3L / 325 / V8
GMC Sierra 1500 Denali 2021 5.3L / 325 / V8
GMC Sierra 1500 Denali 2022 5.3L / 325 / V8 DOES NOT FIT TRUCKS WITH FACTORY SINGLE EXHAUST
GMC Sierra 1500 Denali 2023 5.3L / 325 / V8 DOES NOT FIT FACTORY SINGLE EXHAUST
GMC Sierra 1500 Elevation 2019 5.3L / 325 / V8
GMC Sierra 1500 Elevation 2020 5.3L / 325 / V8
GMC Sierra 1500 Elevation 2021 5.3L / 325 / V8
GMC Sierra 1500 Elevation 2022 5.3L / 325 / V8 DOES NOT FIT TRUCKS WITH FACTORY SINGLE EXHAUST
GMC Sierra 1500 Elevation 2023 5.3L / 325 / V8 DOES NOT FIT FACTORY SINGLE EXHAUST
GMC Sierra 1500 Pro 2022 5.3L / 325 / V8 DOES NOT FIT TRUCKS WITH FACTORY SINGLE EXHAUST
GMC Sierra 1500 Pro 2023 5.3L / 325 / V8 DOES NOT FIT FACTORY SINGLE EXHAUST
GMC Sierra 1500 SLE 2019 5.3L / 325 / V8
GMC Sierra 1500 SLE 2020 5.3L / 325 / V8
GMC Sierra 1500 SLE 2021 5.3L / 325 / V8
GMC Sierra 1500 SLE 2022 5.3L / 325 / V8 DOES NOT FIT TRUCKS WITH FACTORY SINGLE EXHAUST
GMC Sierra 1500 SLE 2023 5.3L / 325 / V8 DOES NOT FIT FACTORY SINGLE EXHAUST
GMC Sierra 1500 SLT 2019 5.3L / 325 / V8
GMC Sierra 1500 SLT 2020 5.3L / 325 / V8
GMC Sierra 1500 SLT 2021 5.3L / 325 / V8
GMC Sierra 1500 SLT 2022 5.3L / 325 / V8 DOES NOT FIT TRUCKS WITH FACTORY SINGLE EXHAUST
GMC Sierra 1500 SLT 2023 5.3L / 325 / V8 DOES NOT FIT FACTORY SINGLE EXHAUST

Specifications:

California Proposition 65 Chemical Name Chromium (hexavalent compounds), Nickel (Metallic)
California Proposition 65 Chemical Name 1 Nickel (Metallic)
California Proposition 65 Chemical Name 2 Chromium (hexavalent compounds)
California Proposition 65 Required Yes
Catalytic Converter Included No
Emission Code 5
Exhaust Series FlowFX
Exit Position Dual Out Rear
Heat Shield No
Material 409 Stainless Steel
Mount Type Uses Factory Hangers
Muffler Body Length (in) 18
Muffler Color Natural
Muffler Finish Brushed
Muffler Inlet Diameter (in) 3
Muffler Inlet Location Centered
Muffler Material 409S Stainless Steel
Muffler Outlet Diameter (in) 2.5
Muffler Outlet Location Dual Outlet
Muffler Overall Length (in) 24
Muffler Part Number Kit Only
Muffler Quantity 1
Muffler Series FlowFX
Muffler Shape Oval
Muffler Type Absorption
Part Type Exhaust System Kit
Product Type Exhaust System
Proposition 65 www.P65Warnings.ca.gov
Single Dual Dual
Sound Level Aggressive / Moderate
System Type Cat-back
Tubing Diameter (in) 2.5
Tubing Material 409S Stainless Steel
Warranty Limited Lifetime (Lifetime)

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