• Flowmaster 99-06 GM Trucks 5.3L FlowFX DOSS Cat-Back Exhaust System
  • Flowmaster 99-06 GM Trucks 5.3L FlowFX DOSS Cat-Back Exhaust System
  • Flowmaster 99-06 GM Trucks 5.3L FlowFX DOSS Cat-Back Exhaust System
  • Flowmaster 99-06 GM Trucks 5.3L FlowFX DOSS Cat-Back Exhaust System
  • Flowmaster 99-06 GM Trucks 5.3L FlowFX DOSS Cat-Back Exhaust System
  • Flowmaster 99-06 GM Trucks 5.3L FlowFX DOSS Cat-Back Exhaust System
  • Flowmaster 99-06 GM Trucks 5.3L FlowFX DOSS Cat-Back Exhaust System
  • Flowmaster 99-06 GM Trucks 5.3L FlowFX DOSS Cat-Back Exhaust System
  • Flowmaster 99-06 GM Trucks 5.3L FlowFX DOSS Cat-Back Exhaust System
  • Flowmaster 99-06 GM Trucks 5.3L FlowFX DOSS Cat-Back Exhaust System
  • Flowmaster 99-06 GM Trucks 5.3L FlowFX DOSS Cat-Back Exhaust System
  • Flowmaster 99-06 GM Trucks 5.3L FlowFX DOSS Cat-Back Exhaust System
  • Flowmaster 99-06 GM Trucks 5.3L FlowFX DOSS Cat-Back Exhaust System
  • Flowmaster 99-06 GM Trucks 5.3L FlowFX DOSS Cat-Back Exhaust System
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Flowmaster

Flowmaster 99-06 GM Trucks 5.3L FlowFX DOSS Cat-Back Exhaust System

Flowmaster 99-06 GM Trucks 5.3L FlowFX DOSS Cat-Back Exhaust System

$ 675.95
$ 743.55 $ 675.95
Free shipping on orders over $99 (contiguous U.S.) — flat $10.99 under $99. Shipping details
✓ In Stock • Ships from manufacturer
Ships from Flowmaster — this item ships direct from the manufacturer. It usually goes out quickly, but because it leaves their warehouse rather than ours, delivery can take a little longer than our in-stock parts.

This Flowmaster® Flow FX® cat-back exhaust system for the 1999-2006 GM 1500 trucks (2007 1500 Classic) with the 4.3, 4.8, or 5.3-liter engine (Crew Cab 5.5' bed, Extra Cab 6.5' bed only) is manufactured using durable 409 stainless steel throughout and features 3.00 to dual 2.50-inch mandrel bent pipes for better exhaust gas flow. A Flow FX "straight-through" muffler is used for a moderate to mild sound level and maximum performance. Maximum increases on the dyno revealed +14 hp and +13 lb-ft at the rear wheels. This system exits out the same side, in front of the rear wheel on the passenger with dual 4.00-inch black ceramic tips for added style and a custom look. The system uses all the existing factory hanger locations and includes installation instructions and all necessary hardware for an easy installation that you can do at home. Backed by Flowmaster's Lifetime Limited Warranty.

  • Flow FX “straight through” performance muffler delivers a deep, moderate performance tone and improves exhaust flow
  • 3.00 to dual 2.50-inch mandrel bent 16-gauge 409 stainless steel tubing maximizes exhaust flow and improves durability
  • Includes complete hardware and factory styled hangers in the stock locations for an easy installation
  • Max increases of up to 14 hp and 13 lb-ft over the stock exhaust at the rear wheels
  • Dual 4.00-inch black ceramic coated tips add a custom look to the truck

Vehicle Fitment

  • 1999-2006 Chevrolet Silverado 1500
  • 1999-2006 GMC Sierra 1500
  • 2007 Chevrolet Silverado 1500 Classic
  • 2007 GMC Sierra 1500 Classic

Please verify exact fitment for your trim and engine before ordering.

🚚 Vendor Direct Shipment: This item is not stocked in our warehouse and ships directly from the manufacturer. Please allow additional handling time before dispatch.

Manufacturer Part Number: 717990

Images are for illustrative purposes only. Actual product may vary.

⚠ WARNING (California Proposition 65): This product can expose you to chemicals which are known to the State of California to cause cancer and/or birth defects or other reproductive harm. For more information go to www.p65warnings.ca.gov.

Manufacturer's Warranty — Flowmaster

Flowmaster warranty is tiered by material and product line. Lifetime Limited Warranty — stainless steel mufflers (FlowFX series excepted), all stainless steel exhaust systems (FlowFX included), stainless steel pipes, air intake kits and oiled-type filters (cleaning kits excepted), and other stainless steel exhaust accessories (exhaust tips and racing products excepted); this runs for the life of the original vehicle the part was installed on. Three (3) years — aluminized steel mufflers, exhaust systems and pipes, all exhaust tips, other non-race exhaust accessories, and commercial-vehicle applications of aluminized or stainless products. Two (2) years — Delta Force dry air intake filter elements. One (1) year — FlowFX series mufflers, Elite Series headers, and electronic components such as Delta Boost modules. Catalytic converters sold under the Flowmaster brand are excluded from this warranty. Coverage runs from the date of original purchase, to the original purchaser only, and only while the part remains on the vehicle it was originally installed on. Header coverage does not extend to damage caused by exhaust insulating wrap and is void if the header was fitted to a new or rebuilt engine during the initial break-in period. Sound-absorbing material inside “straight-through” mufflers degrades over time; Flowmaster treats that as normal wear, not a material defect. Also excluded: interior and exterior sound levels, cosmetic issues such as coatings and material discoloration, installation on a racing vehicle, improper installation or installation contrary to Flowmaster instructions, alteration, misuse, repair, accident, collision, undercarriage road impact or debris, and willful or negligent acts. To claim, the original purchaser returns the product either to the original retailer or directly to Flowmaster — a Returned Material Authorization (RMA) number must be obtained from Flowmaster first if returning to them — with proof of purchase showing place, price, product and date. Flowmaster's remedy is exchange for the same part number or refund of the purchase price at its option; installation, labor, towing and shipping costs are not covered.

Warranty terms are set by the manufacturer and may change. Full details and claims are handled directly by Flowmaster. Contact us if you need help with a warranty claim.

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