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2003 GMC Sierra 1500
1
0
Price Match Guarantee
60-Day Returns
Lifetime Replacement
Price Match Guarantee
60-Day Returns
Lifetime Replacement
Guaranteed to Fit2003 GMC Sierra 1500 Change Vehicle

Flowmaster®
2003 GMC Sierra 1500 - Exhaust System, 5.3/4.8L Engine, 78.0 In. Bed, Extended Cab Pickup

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$449.95
$562.95Save: $113.00(20%)
Manufacturer #17395
Guaranteed to Fit2003 GMC Sierra 1500 Change Vehicle
Qty:
1

Your Vehicle Fit Details

Vehicle Name
Submodel
Engine
Fitment Information
2003 GMC Sierra 1500
SL
8 Cyl 5.3L
78.0 in. Bed, Extended Cab Pickup
2003 GMC Sierra 1500
Base
8 Cyl 5.3L
78.0 in. Bed, Extended Cab Pickup
2003 GMC Sierra 1500
WT
8 Cyl 4.8L
78.0 in. Bed, Extended Cab Pickup
2003 GMC Sierra 1500
SLE
8 Cyl 5.3L
78.0 in. Bed, Extended Cab Pickup
2003 GMC Sierra 1500
WT
8 Cyl 5.3L
78.0 in. Bed, Extended Cab Pickup
2003 GMC Sierra 1500
SLT
8 Cyl 4.8L
78.0 in. Bed, Extended Cab Pickup
2003 GMC Sierra 1500
SL
8 Cyl 4.8L
78.0 in. Bed, Extended Cab Pickup
2003 GMC Sierra 1500
SLT
8 Cyl 5.3L
78.0 in. Bed, Extended Cab Pickup
2003 GMC Sierra 1500
SLE
8 Cyl 4.8L
78.0 in. Bed, Extended Cab Pickup
2003 GMC Sierra 1500
Base
8 Cyl 4.8L
78.0 in. Bed, Extended Cab Pickup

Highlights

Part:
Exhaust System
Brand:
Flowmaster
Notes:
Includes Super 40 Series Muffler
Material:
Made of Aluminized Steel
Series:
American Thunder Series
System Type:
Cat-Back
Quantity Sold:
Kit
Warranty:
3-year Flowmaster limited warranty
Prop 65 Warning:

Warning SymbolWARNING: This product can expose you to chemical which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.

Exit Location:
Exit: After Rear Tire (Dual Passenger Side)
Main Piping Diameter:
2.5 in. Main Pipe
Product Fit:
Direct Fit
Recommended Use:
OE Upgrade
Why Buy:
Aggressive Tone Chambered Muffler
Fitnotes:
78.0 in. Bed, Extended Cab Pickup

Vehicle Fitment Information

Vehicle Name
Submodel
Engine
Fitment Information
1999 GMC C1500
Sierra SL
8 Cyl 5.7L
78.0 in. Bed, Extended Cab Pickup
1999 GMC C1500
Sierra SL
8 Cyl 5.0L
78.0 in. Bed, Extended Cab Pickup
1999-2003 GMC Sierra 1500
SL
8 Cyl 4.8L
78.0 in. Bed, Extended Cab Pickup
1999-2004 GMC Sierra 1500
SLT
8 Cyl 4.8L
78.0 in. Bed, Extended Cab Pickup
1999-2005 Chevrolet Silverado 1500
Base
8 Cyl 5.3L
78.0 in. Bed, Fleetside, Extended Cab Pickup
Page 1 of 6 | Showing 1 - 5 of 27 results

Product Information

FLOWMASTER AMERICAN THUNDER AGGRESSIVE TONE CHAMBERED MUFFLER EXHAUST SYSTEMS

Flowmaster’s American Thunder aggressive tone chambered muffler exhaust systems include mandrel-bent steel tubing and a chambered muffler that’s fine-tuned to deliver improved torque, horsepower and gas mileage, plus the moderately aggressive rumble you crave for your street machine. Flowmaster, known as ‘the exhaust technology company,’ is a leading manufacturer of performance exhaust systems, respected for their design, innovation and engineering.

  • MADE IN USA
  • Offered in aluminized or stainless steel
  • Chambered muffler fine-tunes exhaust tone to moderately aggressive rumble
  • Mandrel-bent tubing allows for continuous airflow
  • Quick and easy installation
  • Direct fit by vehicle year, make and model
  • Proven to improve torque, throttle response, horsepower and fuel economy by rigorous dyno testing
Need help?Call our product expert1-866-529-0412
Chat with us
Mondays - Sundays7am - 11pm ET | 4am - 8pm PT
Warranty Policy
Right parts, guaranteed. If you find any defects, let us know within 60 days and we’ll take care of it. Check out our Warranty Policy for more details.
Shipping Policy
We ship fast so you can get on the road that much faster. Check out our Shipping Policy for more details.
Easy Return Policy
We’re only happy if you’re happy. If you’re not entirely satisfied with your order, you may be entitled to a refund. Check out our Return Policy for more details.

Product Q&A

1
Will this fit Chevrolet crew cab 2006?David J.Apr 09, 2020
0
Will this fit a 2000 Chevy Silverado 1500 5.3l V8 3-Door long bed?JosiahAug 15, 2023
Best Answer:Hi Josiah, I'm glad to assist you. Yes, this is guaranteed to fit the 2000 Silverado 1500 5.3L 3-door extended cab long bed models. Click on the link below for direct ordering to take advantage of our ongoing discount and limited stocks. I hope this helps, and happy shopping. <a href="https://www.carparts.com/exhaust-system/flowmaster/f1317395?can=CPAE1047_CSQA_20230815" target="_blank">https://www.carparts.com/exhaust-system/flowmaster/f1317395?can=CPAE1047_CSQA_20230815</a>
Arnel E.STAFFAug 15, 2023
0
Will this fit a 2002 Silverado 1500 quadrasteer extended cab?Johnathon G.Jul 28, 2023
Best Answer:Hi Johnathon, thank you for reaching out. Yes, but only if it has a 5.3L engine and a 78" long bed. You can click the link below to order the part if you meet the requirements. Have a good one! <a href="https://www.carparts.com/exhaust-system/flowmaster/f1317395?can=cpab2020_csqa_20230728" target="_blank">https://www.carparts.com/exhaust-system/flowmaster/f1317395?can=cpab2020_csqa_20230728</a>
Andrew B.STAFFJul 28, 2023
0
Will this fit a 2000 Silverado ext cab with a 5.3L?Joshua H.Jan 01, 2022
Best Answer:Hi Joshua, I'm glad to help you out. Yes. This item fits the 2000 Chevrolet Silverado 1500 extended cab with 78 inches fleetside bed. Take advantage of our 30-day post-purchase Price Match guarantee. Click this link to order this part: <a href="https://www.carparts.com/exhaust-system/flowmaster/f1317395?can=CPAP3648" target="_blank">https://www.carparts.com/exhaust-system/flowmaster/f1317395?can=CPAP3648</a> I hope this helps. Happy shopping.
Aldrin P.STAFFJan 02, 2022
0
Will this bolt on to a 2006 silverado crew cab?Shelby B.Jan 21, 2021
Best Answer:Hi Shelby, No, this is only for the extended cab.
Grace G.STAFFJan 21, 2021

Customer Reviews

American Thunder Series Cat-Back Exhaust System, Made Of Aluminized Steel
Fit perfectly and sound good
Robert R.
VERIFIED PURCHASER
Purchased on Sep 03, 2020