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Flowmaster American Thunder Cat-Back Exhaust System 817470

Flowmaster American Thunder Cat-Back Exhaust System 817470
Flowmaster American Thunder Cat-Back Exhaust System 817470Flowmaster American Thunder Cat-Back Exhaust System 817470Flowmaster American Thunder Cat-Back Exhaust System 817470Flowmaster American Thunder Cat-Back Exhaust System 817470
$1,711.99 ea
NEWARRIVING SOONEstimated Ship Date 07/03/2025 (If Ordered Today)3 Available from HOLLEY PERFORMANCE PRODUCTS as of 06/15/2025
Model: 4005327
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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For the person who wants the look of a traditional dual exhaust system with all the benefits that a Flowmaster® cat-back exhaust system provides. The American Thunder® exhaust systems are the perfect choice for the person wanting a deep powerful tone outside, with a mild to moderate increase of sound inside the cab. The exhaust system features a dual inlet flange that attaches to the factory flange behind the catalytic converters, all mandrel-bent stainless steel tubing flowing into a Scavenger Series Y-pipe for maximum scavenging of exhaust resulting in increased torque. The system then flows into a 70 Series™ "Big Block II" performance muffler giving you a deep powerful tone outside, and mild to moderate interior tone inside the cab. The dual tailpipes can be configured for either dual out the rear under the bumper for a muscular look, or dual out the sides behind the rear wheels, which is ideal for towing applications. The tailpipes are then finished off with a pair of 3.00-inch polished 304 stainless steel tips. Like all Flowmaster systems, the benefits include improved throttle response, power and mileage. Designed for an easy fit, these systems include all necessary parts and hardware for an easy installation and is covered by our Lifetime Limited Warranty. Note: Fits 2 and 4 wheel drives with the extended cab/shortbed chassis.
Features:
  • Includes Hangers and Hardware for an Easy Installation
  • Mandrel-bent 16-gauge Stainless Steel Tubing
  • Dual 3.00-inch Polished Stainless Steel Tips
  • Connects After Factory Catalytic Converter
  • Covered by our Lifetime Limited Warranty
  • Deep Powerful Exterior Exhaust Tone
  • Uses the Factory Hanger Locations
  • 70 Series Performance Muffler
  • Lifetime Limited Warranty
  • Includes all Hardware
  • Easy Installation
Fits 1996-1999 Chevrolet Silverado, GMC Sierra 1500 trucks with the 5.7L engine using dual catalytic converters, fits extended cab/short bed configuration.
Installation Notes:
Fits 1996-1999 Chevrolet Silverado, GMC Sierra 1500 trucks with the 5.7L engine using dual catalytic converters, fits extended cab/short bed configuration.
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
817470_instructions.pdf3.17MB

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 C1500 Base 1996 5.7L / 350 / V8 With Dual Catalytic Converter. Extended cab/Short bed only.
Chevrolet C1500 Base 1997 5.7L / 350 / V8 With Dual Catalytic Converter. Extended cab/Short bed only.
Chevrolet C1500 Cheyenne 1996 5.7L / 350 / V8 With Dual Catalytic Converter. Extended cab/Short bed only.
Chevrolet C1500 Cheyenne 1997 5.7L / 350 / V8 With Dual Catalytic Converter. Extended cab/Short bed only.
Chevrolet C1500 Cheyenne 1998 5.7L / 350 / V8 With Dual Catalytic Converter. Extended cab/Short bed only.
Chevrolet C1500 LS 1999 5.7L / 350 / V8 With Dual Catalytic Converter. Extended cab/Short bed only.
Chevrolet C1500 Silverado 1996 5.7L / 350 / V8 With Dual Catalytic Converter. Extended cab/Short bed only.
Chevrolet C1500 Silverado 1997 5.7L / 350 / V8 With Dual Catalytic Converter. Extended cab/Short bed only.
Chevrolet C1500 Silverado 1998 5.7L / 350 / V8 With Dual Catalytic Converter. Extended cab/Short bed only.
Chevrolet K1500 Base 1996 5.7L / 350 / V8 With Dual Catalytic Converter. Extended cab/Short bed only.
Chevrolet K1500 Base 1997 5.7L / 350 / V8 With Dual Catalytic Converter. Extended cab/Short bed only.
Chevrolet K1500 Cheyenne 1996 5.7L / 350 / V8 With Dual Catalytic Converter. Extended cab/Short bed only.
Chevrolet K1500 Cheyenne 1997 5.7L / 350 / V8 With Dual Catalytic Converter. Extended cab/Short bed only.
Chevrolet K1500 Cheyenne 1998 5.7L / 350 / V8 With Dual Catalytic Converter. Extended cab/Short bed only.
Chevrolet K1500 LS 1999 5.7L / 350 / V8 With Dual Catalytic Converter. Extended cab/Short bed only.
Chevrolet K1500 Silverado 1996 5.7L / 350 / V8 With Dual Catalytic Converter. Extended cab/Short bed only.
Chevrolet K1500 Silverado 1997 5.7L / 350 / V8 With Dual Catalytic Converter. Extended cab/Short bed only.
Chevrolet K1500 Silverado 1998 5.7L / 350 / V8 With Dual Catalytic Converter. Extended cab/Short bed only.
GMC C1500 Sierra SLE 1996 5.7L / 350 / V8 With Dual Catalytic Converter. Extended cab/Short bed only.
GMC C1500 Sierra SLE 1997 5.7L / 350 / V8 With Dual Catalytic Converter. Extended cab/Short bed only.
GMC C1500 Sierra SLE 1998 5.7L / 350 / V8 With Dual Catalytic Converter. Extended cab/Short bed only.
GMC C1500 Sierra SLE 1999 5.7L / 350 / V8 With Dual Catalytic Converter. Extended cab/Short bed only.
GMC C1500 Sierra SLT 1996 5.7L / 350 / V8 With Dual Catalytic Converter. Extended cab/Short bed only.
GMC C1500 Sierra SLT 1997 5.7L / 350 / V8 With Dual Catalytic Converter. Extended cab/Short bed only.
GMC C1500 Sierra SLT 1998 5.7L / 350 / V8 With Dual Catalytic Converter. Extended cab/Short bed only.
GMC C1500 Sierra SLT 1999 5.7L / 350 / V8 With Dual Catalytic Converter. Extended cab/Short bed only.
GMC C1500 Sierra SL 1996 5.7L / 350 / V8 With Dual Catalytic Converter. Extended cab/Short bed only.
GMC C1500 Sierra SL 1997 5.7L / 350 / V8 With Dual Catalytic Converter. Extended cab/Short bed only.
GMC C1500 Sierra SL 1998 5.7L / 350 / V8 With Dual Catalytic Converter. Extended cab/Short bed only.
GMC C1500 Sierra SL 1999 5.7L / 350 / V8 With Dual Catalytic Converter. Extended cab/Short bed only.
GMC K1500 Sierra SLE 1996 5.7L / 350 / V8 With Dual Catalytic Converter. Extended cab/Short bed only.
GMC K1500 Sierra SLE 1997 5.7L / 350 / V8 With Dual Catalytic Converter. Extended cab/Short bed only.
GMC K1500 Sierra SLE 1998 5.7L / 350 / V8 With Dual Catalytic Converter. Extended cab/Short bed only.
GMC K1500 Sierra SLT 1996 5.7L / 350 / V8 With Dual Catalytic Converter. Extended cab/Short bed only.
GMC K1500 Sierra SLT 1997 5.7L / 350 / V8 With Dual Catalytic Converter. Extended cab/Short bed only.
GMC K1500 Sierra SLT 1998 5.7L / 350 / V8 With Dual Catalytic Converter. Extended cab/Short bed only.
GMC K1500 Sierra SL 1996 5.7L / 350 / V8 With Dual Catalytic Converter. Extended cab/Short bed only.
GMC K1500 Sierra SL 1997 5.7L / 350 / V8 With Dual Catalytic Converter. Extended cab/Short bed only.
GMC K1500 Sierra SL 1998 5.7L / 350 / V8 With Dual Catalytic Converter. Extended cab/Short bed only.

Specifications:

2WD/4WD 2WD/4WD
California Proposition 65 Chemical Name Chromium (hexavalent compounds), Nickel (Metallic)
California Proposition 65 Required Yes
Emission Code 5
Exhaust Series American Thunder
Exit Position Dual Out Rear / Dual Out Side
Heat Shield No
Inlet Diameter (in) 2
Material 409 Stainless Steel
Muffler Part Number Kit Only
Muffler Quantity 1
Muffler Series 70 Series Big Block
Outlet Diameter (in) 2.5
Part Type Exhaust System Kit
Product Type Exhaust System
Proposition 65 www.P65Warnings.ca.gov
Single Dual Dual
Sound Level Moderate
System Type Cat-back
Tip Diameter (in) 3
Tip Quantity 2
Tubing Diameter (in) 2.5
Warranty Limited Lifetime (Lifetime)

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