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Flowmaster FlowFX Cat-Back Exhaust System 717873

Flowmaster FlowFX Cat-Back Exhaust System 717873
Flowmaster FlowFX Cat-Back Exhaust System 717873Flowmaster FlowFX Cat-Back Exhaust System 717873Flowmaster FlowFX Cat-Back Exhaust System 717873Flowmaster FlowFX Cat-Back Exhaust System 717873Flowmaster FlowFX Cat-Back Exhaust System 717873
$903.99 ea
NEWARRIVING SOONEstimated Ship Date 08/27/2025 (If Ordered Today)38 Available from HOLLEY PERFORMANCE PRODUCTS as of 08/09/2025
Model: 4005683
Select a Vehicle or refer to the Vehicle Fitment Tab below to verify that this part fits your vehicle.
OVERSIZE 2
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This Flowmaster FlowFX cat-back exhaust system is designed for 1999-2007* (*Classic Body) GM Silverado/Sierra 1500 trucks with 4.3L, 4.8L & 5.3L engines and features 409 stainless steel construction for added durability and 16-gauge mandrel-bent tubing for free unrestricted flow. The compact, oval "straight-through" FlowFX performance muffler attaches behind the catalytic converter and delivers a moderate, deep and powerful sound with minimal interior resonance. The mandrel-bent stainless tailpipe tucks up high in the undercarriage protecting it from being crushed when traversing rocky terrain. This system uses the factory hanger locations and is finished off with a 4.50-inch black ceramic-coated 304 stainless steel tip embossed with the Flowmaster name. The kit includes detailed instructions and all hardware necessary for a quick and easy installation you can do at home. Covered by our Lifetime Limited Warranty.
Features:
  • Increases of 6.7 HP and 6.5 FT/LBS over the stock exhaust
  • System produces a nice rumble with minimal internal resonance
  • Large 4.50-inch black ceramic coated stainless steel tip offers an aggressive look
  • Includes complete hardware and factory styled hangers in stock locations for an easy installation
  • FlowFX "straight-through" performance muffler delivers a deep tone and improved exhaust flow
  • Mandrel-bent 16-gauge 409 stainless steel tubing maximizes exhaust flow with excellent corrosion resistance
  • Lifetime Limited Warranty
Fits 1999-2007* (*Classic body) GM Silverado/Sierra 1500 trucks with 4.3L, 4.8L and 5.3L engines, 2/4 wheel drive with 143.5-inch wheelbase.
Installation Notes:
Fits 1999-2007* (*Classic body) GM Silverado/Sierra 1500 trucks with 4.3L, 4.8L and 5.3L engines, 2/4 wheel drive with 143.5-inch wheelbase.
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
717873_intructions.pdf2.59MB

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 Classic Hybrid 2007 5.3L / 325 / V8 fits extended cab with 6.5 foot bed and crew cab with 5.5 foot bed trucks - both with 143.5” wheelbase length.
Chevrolet Silverado 1500 Classic LS 2007 4.8L / 294 / V8
4.3L / 262 / V6
5.3L / 325 / V8		 fits extended cab with 6.5 foot bed and crew cab with 5.5 foot bed trucks - both with 143.5” wheelbase length.
Chevrolet Silverado 1500 Classic LT 2007 5.3L / 325 / V8
4.8L / 294 / V8		 fits extended cab with 6.5 foot bed and crew cab with 5.5 foot bed trucks - both with 143.5” wheelbase length.
Chevrolet Silverado 1500 Classic WT 2007 4.8L / 294 / V8
4.3L / 262 / V6
5.3L / 325 / V8		 fits extended cab with 6.5 foot bed and crew cab with 5.5 foot bed trucks - both with 143.5” wheelbase length.
Chevrolet Silverado 1500 Base 1999 4.3L / 262 / V6
4.8L / 294 / V8
5.3L / 325 / V8		 fits extended cab with 6.5 foot bed and crew cab with 5.5 foot bed trucks - both with 143.5” wheelbase length.
Chevrolet Silverado 1500 Base 2000 4.3L / 262 / V6
4.8L / 294 / V8
5.3L / 325 / V8		 fits extended cab with 6.5 foot bed and crew cab with 5.5 foot bed trucks - both with 143.5” wheelbase length.
Chevrolet Silverado 1500 Base 2001 4.3L / 262 / V6
4.8L / 294 / V8
5.3L / 325 / V8		 fits extended cab with 6.5 foot bed and crew cab with 5.5 foot bed trucks - both with 143.5” wheelbase length.
Chevrolet Silverado 1500 Base 2002 4.3L / 262 / V6
4.8L / 294 / V8
5.3L / 325 / V8		 fits extended cab with 6.5 foot bed and crew cab with 5.5 foot bed trucks - both with 143.5” wheelbase length.
Chevrolet Silverado 1500 Base 2003 4.3L / 262 / V6
4.8L / 294 / V8
5.3L / 325 / V8		 fits extended cab with 6.5 foot bed and crew cab with 5.5 foot bed trucks - both with 143.5” wheelbase length.
Chevrolet Silverado 1500 Base 2004 4.3L / 262 / V6
4.8L / 294 / V8
5.3L / 325 / V8		 fits extended cab with 6.5 foot bed and crew cab with 5.5 foot bed trucks - both with 143.5” wheelbase length.
Chevrolet Silverado 1500 Base 2005 4.3L / 262 / V6
4.8L / 294 / V8
5.3L / 325 / V8		 fits extended cab with 6.5 foot bed and crew cab with 5.5 foot bed trucks - both with 143.5” wheelbase length.
Chevrolet Silverado 1500 Base 2006 4.3L / 262 / V6 fits extended cab with 6.5 foot bed and crew cab with 5.5 foot bed trucks - both with 143.5” wheelbase length.
Chevrolet Silverado 1500 Custom 2002 4.3L / 262 / V6 fits extended cab with 6.5 foot bed and crew cab with 5.5 foot bed trucks - both with 143.5” wheelbase length.
Chevrolet Silverado 1500 Hybrid 2004 5.3L / 325 / V8 fits extended cab with 6.5 foot bed and crew cab with 5.5 foot bed trucks - both with 143.5” wheelbase length.
Chevrolet Silverado 1500 Hybrid 2005 5.3L / 325 / V8 fits extended cab with 6.5 foot bed and crew cab with 5.5 foot bed trucks - both with 143.5” wheelbase length.
Chevrolet Silverado 1500 Hybrid 2006 5.3L / 325 / V8 fits extended cab with 6.5 foot bed and crew cab with 5.5 foot bed trucks - both with 143.5” wheelbase length.
Chevrolet Silverado 1500 LS 1999 5.3L / 325 / V8
4.3L / 262 / V6
4.8L / 294 / V8		 fits extended cab with 6.5 foot bed and crew cab with 5.5 foot bed trucks - both with 143.5” wheelbase length.
Chevrolet Silverado 1500 LS 2000 5.3L / 325 / V8
4.3L / 262 / V6
4.8L / 294 / V8		 fits extended cab with 6.5 foot bed and crew cab with 5.5 foot bed trucks - both with 143.5” wheelbase length.
Chevrolet Silverado 1500 LS 2001 5.3L / 325 / V8
4.3L / 262 / V6
4.8L / 294 / V8		 fits extended cab with 6.5 foot bed and crew cab with 5.5 foot bed trucks - both with 143.5” wheelbase length.
Chevrolet Silverado 1500 LS 2002 5.3L / 325 / V8
4.3L / 262 / V6
4.8L / 294 / V8		 fits extended cab with 6.5 foot bed and crew cab with 5.5 foot bed trucks - both with 143.5” wheelbase length.
Chevrolet Silverado 1500 LS 2003 5.3L / 325 / V8
4.3L / 262 / V6
4.8L / 294 / V8		 fits extended cab with 6.5 foot bed and crew cab with 5.5 foot bed trucks - both with 143.5” wheelbase length.
Chevrolet Silverado 1500 LS 2004 5.3L / 325 / V8
4.3L / 262 / V6
4.8L / 294 / V8		 fits extended cab with 6.5 foot bed and crew cab with 5.5 foot bed trucks - both with 143.5” wheelbase length.
Chevrolet Silverado 1500 LS 2005 5.3L / 325 / V8
4.3L / 262 / V6
4.8L / 294 / V8		 fits extended cab with 6.5 foot bed and crew cab with 5.5 foot bed trucks - both with 143.5” wheelbase length.
Chevrolet Silverado 1500 LS 2006 5.3L / 325 / V8
4.3L / 262 / V6
4.8L / 294 / V8		 fits extended cab with 6.5 foot bed and crew cab with 5.5 foot bed trucks - both with 143.5” wheelbase length.
Chevrolet Silverado 1500 LT 1999 4.3L / 262 / V6
4.8L / 294 / V8
5.3L / 325 / V8		 fits extended cab with 6.5 foot bed and crew cab with 5.5 foot bed trucks - both with 143.5” wheelbase length.
Chevrolet Silverado 1500 LT 2000 4.3L / 262 / V6
4.8L / 294 / V8
5.3L / 325 / V8		 fits extended cab with 6.5 foot bed and crew cab with 5.5 foot bed trucks - both with 143.5” wheelbase length.
Chevrolet Silverado 1500 LT 2001 4.3L / 262 / V6
4.8L / 294 / V8
5.3L / 325 / V8		 fits extended cab with 6.5 foot bed and crew cab with 5.5 foot bed trucks - both with 143.5” wheelbase length.
Chevrolet Silverado 1500 LT 2002 4.3L / 262 / V6
4.8L / 294 / V8
5.3L / 325 / V8		 fits extended cab with 6.5 foot bed and crew cab with 5.5 foot bed trucks - both with 143.5” wheelbase length.
Chevrolet Silverado 1500 LT 2003 4.3L / 262 / V6
4.8L / 294 / V8
5.3L / 325 / V8		 fits extended cab with 6.5 foot bed and crew cab with 5.5 foot bed trucks - both with 143.5” wheelbase length.
Chevrolet Silverado 1500 LT 2004 4.3L / 262 / V6
4.8L / 294 / V8
5.3L / 325 / V8		 fits extended cab with 6.5 foot bed and crew cab with 5.5 foot bed trucks - both with 143.5” wheelbase length.
Chevrolet Silverado 1500 LT 2005 4.3L / 262 / V6
4.8L / 294 / V8
5.3L / 325 / V8		 fits extended cab with 6.5 foot bed and crew cab with 5.5 foot bed trucks - both with 143.5” wheelbase length.
Chevrolet Silverado 1500 LT 2006 4.8L / 294 / V8
5.3L / 325 / V8		 fits extended cab with 6.5 foot bed and crew cab with 5.5 foot bed trucks - both with 143.5” wheelbase length.
Chevrolet Silverado 1500 WT 2002 4.3L / 262 / V6
4.8L / 294 / V8
5.3L / 325 / V8		 fits extended cab with 6.5 foot bed and crew cab with 5.5 foot bed trucks - both with 143.5” wheelbase length.
Chevrolet Silverado 1500 WT 2003 4.3L / 262 / V6
4.8L / 294 / V8
5.3L / 325 / V8		 fits extended cab with 6.5 foot bed and crew cab with 5.5 foot bed trucks - both with 143.5” wheelbase length.
Chevrolet Silverado 1500 WT 2004 4.3L / 262 / V6
4.8L / 294 / V8
5.3L / 325 / V8		 fits extended cab with 6.5 foot bed and crew cab with 5.5 foot bed trucks - both with 143.5” wheelbase length.
Chevrolet Silverado 1500 WT 2006 4.3L / 262 / V6
4.8L / 294 / V8
5.3L / 325 / V8		 fits extended cab with 6.5 foot bed and crew cab with 5.5 foot bed trucks - both with 143.5” wheelbase length.
GMC Sierra 1500 Classic Hybrid 2007 5.3L / 325 / V8 fits extended cab with 6.5 foot bed and crew cab with 5.5 foot bed trucks - both with 143.5” wheelbase length.
GMC Sierra 1500 Classic SLE 2007 4.8L / 294 / V8
5.3L / 325 / V8		 fits extended cab with 6.5 foot bed and crew cab with 5.5 foot bed trucks - both with 143.5” wheelbase length.
GMC Sierra 1500 Classic SLT 2007 5.3L / 325 / V8 fits extended cab with 6.5 foot bed and crew cab with 5.5 foot bed trucks - both with 143.5” wheelbase length.
GMC Sierra 1500 Classic SL 2007 4.8L / 294 / V8
4.3L / 262 / V6
5.3L / 325 / V8		 fits extended cab with 6.5 foot bed and crew cab with 5.5 foot bed trucks - both with 143.5” wheelbase length.
GMC Sierra 1500 Classic WT 2007 4.8L / 294 / V8
4.3L / 262 / V6
5.3L / 325 / V8		 fits extended cab with 6.5 foot bed and crew cab with 5.5 foot bed trucks - both with 143.5” wheelbase length.
GMC Sierra 1500 Base 2002 4.3L / 262 / V6
4.8L / 294 / V8
5.3L / 325 / V8		 fits extended cab with 6.5 foot bed and crew cab with 5.5 foot bed trucks - both with 143.5” wheelbase length.
GMC Sierra 1500 Base 2003 4.3L / 262 / V6
4.8L / 294 / V8
5.3L / 325 / V8		 fits extended cab with 6.5 foot bed and crew cab with 5.5 foot bed trucks - both with 143.5” wheelbase length.
GMC Sierra 1500 Base 2004 4.3L / 262 / V6
4.8L / 294 / V8
5.3L / 325 / V8		 fits extended cab with 6.5 foot bed and crew cab with 5.5 foot bed trucks - both with 143.5” wheelbase length.
GMC Sierra 1500 Base 2005 4.3L / 262 / V6
4.8L / 294 / V8
5.3L / 325 / V8		 fits extended cab with 6.5 foot bed and crew cab with 5.5 foot bed trucks - both with 143.5” wheelbase length.
GMC Sierra 1500 HT 2002 4.8L / 294 / V8
4.3L / 262 / V6
5.3L / 325 / V8		 fits extended cab with 6.5 foot bed and crew cab with 5.5 foot bed trucks - both with 143.5” wheelbase length.
GMC Sierra 1500 Hybrid 2005 5.3L / 325 / V8 fits extended cab with 6.5 foot bed and crew cab with 5.5 foot bed trucks - both with 143.5” wheelbase length.
GMC Sierra 1500 Hybrid 2006 5.3L / 325 / V8 fits extended cab with 6.5 foot bed and crew cab with 5.5 foot bed trucks - both with 143.5” wheelbase length.
GMC Sierra 1500 SLE 1999 4.3L / 262 / V6
4.8L / 294 / V8
5.3L / 325 / V8		 fits extended cab with 6.5 foot bed and crew cab with 5.5 foot bed trucks - both with 143.5” wheelbase length.
GMC Sierra 1500 SLE 2000 4.3L / 262 / V6
4.8L / 294 / V8
5.3L / 325 / V8		 fits extended cab with 6.5 foot bed and crew cab with 5.5 foot bed trucks - both with 143.5” wheelbase length.
GMC Sierra 1500 SLE 2001 4.3L / 262 / V6
4.8L / 294 / V8
5.3L / 325 / V8		 fits extended cab with 6.5 foot bed and crew cab with 5.5 foot bed trucks - both with 143.5” wheelbase length.
GMC Sierra 1500 SLE 2002 4.3L / 262 / V6
4.8L / 294 / V8
5.3L / 325 / V8		 fits extended cab with 6.5 foot bed and crew cab with 5.5 foot bed trucks - both with 143.5” wheelbase length.
GMC Sierra 1500 SLE 2003 4.3L / 262 / V6
4.8L / 294 / V8
5.3L / 325 / V8		 fits extended cab with 6.5 foot bed and crew cab with 5.5 foot bed trucks - both with 143.5” wheelbase length.
GMC Sierra 1500 SLE 2004 4.3L / 262 / V6
4.8L / 294 / V8
5.3L / 325 / V8		 fits extended cab with 6.5 foot bed and crew cab with 5.5 foot bed trucks - both with 143.5” wheelbase length.
GMC Sierra 1500 SLE 2005 4.8L / 294 / V8
5.3L / 325 / V8		 fits extended cab with 6.5 foot bed and crew cab with 5.5 foot bed trucks - both with 143.5” wheelbase length.
GMC Sierra 1500 SLE 2006 4.8L / 294 / V8
5.3L / 325 / V8		 fits extended cab with 6.5 foot bed and crew cab with 5.5 foot bed trucks - both with 143.5” wheelbase length.
GMC Sierra 1500 SLT 1999 4.8L / 294 / V8
4.3L / 262 / V6
5.3L / 325 / V8		 fits extended cab with 6.5 foot bed and crew cab with 5.5 foot bed trucks - both with 143.5” wheelbase length.
GMC Sierra 1500 SLT 2000 4.8L / 294 / V8
4.3L / 262 / V6
5.3L / 325 / V8		 fits extended cab with 6.5 foot bed and crew cab with 5.5 foot bed trucks - both with 143.5” wheelbase length.
GMC Sierra 1500 SLT 2001 4.8L / 294 / V8
4.3L / 262 / V6
5.3L / 325 / V8		 fits extended cab with 6.5 foot bed and crew cab with 5.5 foot bed trucks - both with 143.5” wheelbase length.
GMC Sierra 1500 SLT 2002 4.8L / 294 / V8
4.3L / 262 / V6
5.3L / 325 / V8		 fits extended cab with 6.5 foot bed and crew cab with 5.5 foot bed trucks - both with 143.5” wheelbase length.
GMC Sierra 1500 SLT 2003 4.8L / 294 / V8
4.3L / 262 / V6
5.3L / 325 / V8		 fits extended cab with 6.5 foot bed and crew cab with 5.5 foot bed trucks - both with 143.5” wheelbase length.
GMC Sierra 1500 SLT 2004 4.8L / 294 / V8
4.3L / 262 / V6
5.3L / 325 / V8		 fits extended cab with 6.5 foot bed and crew cab with 5.5 foot bed trucks - both with 143.5” wheelbase length.
GMC Sierra 1500 SLT 2005 5.3L / 325 / V8 fits extended cab with 6.5 foot bed and crew cab with 5.5 foot bed trucks - both with 143.5” wheelbase length.
GMC Sierra 1500 SLT 2006 5.3L / 325 / V8 fits extended cab with 6.5 foot bed and crew cab with 5.5 foot bed trucks - both with 143.5” wheelbase length.
GMC Sierra 1500 SL 1999 4.8L / 294 / V8
4.3L / 262 / V6
5.3L / 325 / V8		 fits extended cab with 6.5 foot bed and crew cab with 5.5 foot bed trucks - both with 143.5” wheelbase length.
GMC Sierra 1500 SL 2000 4.8L / 294 / V8
4.3L / 262 / V6
5.3L / 325 / V8		 fits extended cab with 6.5 foot bed and crew cab with 5.5 foot bed trucks - both with 143.5” wheelbase length.
GMC Sierra 1500 SL 2001 4.8L / 294 / V8
4.3L / 262 / V6
5.3L / 325 / V8		 fits extended cab with 6.5 foot bed and crew cab with 5.5 foot bed trucks - both with 143.5” wheelbase length.
GMC Sierra 1500 SL 2002 4.8L / 294 / V8
4.3L / 262 / V6
5.3L / 325 / V8		 fits extended cab with 6.5 foot bed and crew cab with 5.5 foot bed trucks - both with 143.5” wheelbase length.
GMC Sierra 1500 SL 2003 4.8L / 294 / V8
4.3L / 262 / V6
5.3L / 325 / V8		 fits extended cab with 6.5 foot bed and crew cab with 5.5 foot bed trucks - both with 143.5” wheelbase length.
GMC Sierra 1500 SL 2006 4.8L / 294 / V8
4.3L / 262 / V6
5.3L / 325 / V8		 fits extended cab with 6.5 foot bed and crew cab with 5.5 foot bed trucks - both with 143.5” wheelbase length.
GMC Sierra 1500 WT 2002 5.3L / 325 / V8
4.3L / 262 / V6
4.8L / 294 / V8		 fits extended cab with 6.5 foot bed and crew cab with 5.5 foot bed trucks - both with 143.5” wheelbase length.
GMC Sierra 1500 WT 2003 5.3L / 325 / V8
4.3L / 262 / V6
4.8L / 294 / V8		 fits extended cab with 6.5 foot bed and crew cab with 5.5 foot bed trucks - both with 143.5” wheelbase length.
GMC Sierra 1500 WT 2004 5.3L / 325 / V8
4.3L / 262 / V6
4.8L / 294 / V8		 fits extended cab with 6.5 foot bed and crew cab with 5.5 foot bed trucks - both with 143.5” wheelbase length.
GMC Sierra 1500 WT 2005 5.3L / 325 / V8
4.3L / 262 / V6
4.8L / 294 / V8		 fits extended cab with 6.5 foot bed and crew cab with 5.5 foot bed trucks - both with 143.5” wheelbase length.
GMC Sierra 1500 WT 2006 5.3L / 325 / V8
4.3L / 262 / V6
4.8L / 294 / V8		 fits extended cab with 6.5 foot bed and crew cab with 5.5 foot bed trucks - both with 143.5” wheelbase length.

Specifications:

California Proposition 65 Chemical Name Chromium (hexavalent compounds), Nickel (Metallic)
California Proposition 65 Required Yes
Catalytic Converter Included No
Emission Code 5
Exhaust Series FlowFX
Exit Position Single Out Side
Heat Shield No
Material 409 Stainless Steel
Muffler Body Length (in) 18
Muffler Color Natural
Muffler Finish Brushed
Muffler Inlet Diameter (in) 3
Muffler Material 409S Stainless Steel
Muffler Outlet Diameter (in) 3
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 Single
Sound Level Aggressive / Moderate
System Type Cat-back
Tip Cut Angle
Tip Diameter 4.5
Tip Edge Style Rolled
Tip Finish Black Ceramic
Tip Length 11
Tip Logo Embossed
Tip Material 304 Stainless
Tip Quantity 1
Tip Shape Round
Tubing Diameter (in) 3
Tubing Material 409S Stainless Steel

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