Flowmaster® - American Thunder™ Exhaust System

4.553 reviews / Item # sp25
Flowmaster® - American Thunder™ Stainless Steel Cat-Back Exhaust System (Dual Rear Exit)
Flowmaster® - American Thunder™ Stainless Steel Cat-Back Exhaust System (Dual Rear Exit)Flowmaster® - American Thunder™ Stainless Steel Cat-Back Exhaust System (Dual Rear Exit)Flowmaster® - American Thunder™ Aluminized Steel Axle-Back Exhaust System (Single Rear Exit)Flowmaster® - American Thunder™ Aluminized Steel DownPipe-Back Exhaust System (Single Side Exit)Flowmaster® - American Thunder™ Stainless Steel Axle-Back Exhaust System (Dual Out Rear Exit)Flowmaster® - American Thunder™ Aluminized Steel Cat-Back Exhaust System (Dual Rear Exit)Flowmaster® - American Thunder™ Aluminized Steel Cat-Back Exhaust System (Dual Rear Exit)Flowmaster® - American Thunder™ Stainless Steel Header-Back Exhaust System (Dual Rear Exit)Flowmaster® - American Thunder™ Aluminized Steel Cat-Back Exhaust System (Dual Same Side Exit)Flowmaster® - American Thunder™ Stainless Steel Cat-Back Exhaust System (Dual Out Rear Exit)Flowmaster® - American Thunder™ Stainless Steel Cat-Back Exhaust System (Dual Out Rear Exit)Flowmaster® - American Thunder™ Stainless Steel Crossmember-Back Exhaust System (Dual Out Side Exit)Flowmaster® - Exhaust TypesFlowmaster® - American Thunder™ Stainless Steel Cat-Back Exhaust System Installation InstructionsFlowmaster® - CatalogFlowmaster® - FAQFlowmaster® - Types of MufflersFlowmaster® -  Exhaust Systems ComparisonFlowmaster® - WarrantyFlowmaster® - American Thunder™ Exhaust Systems Aggressive SoundFlowmaster® - Product Information and TechnologyMade In USAFlowmaster Authorized Dealer
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Product Details

Learn everything you want to know about this product
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flowmaster exhaust system

American Thunder™ Exhaust System by Flowmaster®. American Thunder gives you the Mild-Moderate Sound / Moderate Sound / Aggressive Sound / Moderate-Aggressive Sound / Mild Sound (depends on application and exhaust type) of a Flowmaster chambered exhaust, which is the classic sound of classic American big performance engines. This is a system that gives the most sedate vehicle a performance rumble. American Thunder is perfect for a wide range of cars, from ponies to sleepers.

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Features:

  • High Quality Performance Sound
  • Increases Power
  • Increases Torque
  • Every System Tuned on Dynamometer
  • Perfect Fitment

American Thunder gives you exactly the sound that is promised by the name of the series. The exhaust sound of the American Thunder system has become a symbol of American power that is recognized all over the world. American Thunder is the most popular of the Flowmaster exhaust systems, enhancing power, torque, throttle response and mileage for automobile enthusiasts all over the world.

All Flowmaster exhaust systems give the same improvement of performance. All Flowmaster exhaust systems produce a beautiful deep performance tone. Choosing between the five different exhaust systems is not a technical decision – it is all up to your personal taste. It’s A Sound Decision™. The racing origin is evident in every Flowmaster exhaust system. All the five series of systems are tuned for maximum performance. They differ in technology and tuning, and thus in tone and character, giving you a performance engine sound to your personal liking.

Flowmaster exhaust systems employ two unique technologies, the patented Delta Flow and the Laminar Flow. They give different characters of sound and can be tuned to achieve the desired exhaust note. Flowmaster Exhaust System Technology is so versatile and gives such a high degree of control that it is used both by racers, who want maximum power, and by the U.S. Air Force in Stealth applications, where maximum silence and minimum heat emissions are prime considerations.

Be it for a domestic or import truck, SUV, off-road warrior, daily driver, muscle car, euro-spec cruiser or sport compact vehicle, Flowmaster technicians personally hand select the right muffler, tubing size, resonator, and tip to make the process easy for you. Best of all, Flowmaster stainless steel exhaust systems are covered by a Limited Lifetime Warranty; ensuring that your exhaust will last as long as you own your vehicle. If you choose aluminized steel products, Flowmaster backs them up with a 3-year warranty.

Flowmaster® has its roots in solving the engine noise problems encountered by California racers in the 1980s. In 1983 Flowmaster’s founder, Ray Flugger, created his first patented design of racing silencers, which dampened noise with minimal loss of power. Ray attached handles to ease carrying the square shaped race mufflers through the race pits, and the mufflers became known as the "suitcase mufflers." Today, the innovative Flowmaster mufflers are the result of years of development with top race engine builders, thousands of hours of dyno research and "real-world" on-track testing.

Warranty Information

Find out everything you need to know about the product warranty

Lifetime Limited Warranty applies to Flowmaster stainless steel mufflers, stainless steel exhaust systems, stainless steel pipes and other stainless steel exhaust accessories (except exhaust tips).

Three (3) Year Limited Warranty applies to Flowmaster aluminized steel mufflers, aluminized steel exhaust systems, aluminized steel pipes, exhaust tips and other non-race exhaust accessories.

One (1) Year Limited Warranty applies to Elite Series exhaust headers. Flowmaster, Inc. (“Flowmaster”) extends the following limited warranty to the original purchaser of its mufflers, exhaust systems, pipes, exhaust tips, headers and other non-race accessories (hereafter “products”), excluding catalytic converters sold under the Flowmaster® brand.

Flowmaster warrants the products mentioned above against defects in materials and workmanship for the period set forth below, when they are owned by the original purchaser and remain installed on the vehicle on which they were originally installed. This warranty is void if the product was not installed properly on the vehicle, was installed on a vehicle for which it was not designed, or was removed from the vehicle on which it was originally installed and reinstalled on another vehicle. This warranty shall not apply to normal wear, cosmetic issues such as coatings and material discoloration, any product that was installed on a racing vehicle, installed improperly or contrary to Flowmaster instructions, altered, misused, repaired, damaged from an accident, collision, undercarriage road impact or debris, or willful or negligent act.

The warranty set forth herein for Flowmaster® stainless steel mufflers, stainless steel exhaust systems, stainless steel pipes and other stainless steel exhaust accessories (except exhaust tips) extends for a period of the life of the original vehicle the product was installed on. The warranty set forth herein for Flowmaster aluminized steel mufflers, aluminized steel exhaust systems, aluminized steel pipes, all exhaust tips and non-race exhaust accessories and commercial applications of aluminized steel products or stainless steel products extends for a period of three (3) years from the date of original purchase and the original vehicle it was installed on. The warranty set forth herein for Flowmaster exhaust headers extends for a period of one (1) year from the date of original purchase and the original vehicle it was installed on. Header warranty does not cover damages caused by exhaust insulating wrap, and is void if the product was installed on a new or rebuilt engine during the initial break-in period.

To make any claim under the terms of this limited warranty, the original purchaser MUST either return the product to the original retailer or directly to Flowmaster. If the original purchaser elects to return the product to Flowmaster directly, he or she must first contact Flowmaster and obtain a Returned Material Authorization (RMA) number. Once the RMA number is received, the original purchaser may return the product to Flowmaster® at 1500 Overland Court, Sacramento, CA 95691 (or such other address provided by Flowmaster) along with the RMA number and Proof of Purchase of the covered product. The Proof of Purchase must clearly show the place of purchase, purchase price, product purchased, and date of purchase. If upon inspection by Flowmaster the product is found to be defective in material or workmanship, Flowmaster shall at its option, either exchange the product for new product with the same part number or refund the original purchase price.

This warranty is not contingent upon the purchaser’s completion of the Warranty Registration Form found on the Flowmaster® website. If however the purchaser completes and submits that form at the time of purchase, Flowmaster will keep that form on file which may serve as an aid in determining warranty coverage in the event of the loss of the original purchase receipt.

Flowmaster’s liability is expressly limited to the replacement of the product or refund of the purchase price as described herein. Flowmaster® shall have no liability for the cost of installation or removal of the defective product, the cost of labor or any additional parts required to complete the installation of the replacement product, towing or transportation costs, or return shipping costs. In no event shall Flowmaster be liable for any direct, indirect, special, incidental or consequential losses and/or damages, including but not limited to interruption of business or loss of business or loss of profit or damage to related components resulting from the use of or inability to use the product, or any breach of warranty or any defect in the product, even if Flowmaster shall have been advised of the possibility of such potential losses or damages. Some states do not allow the exclusion or limitation of incidental or consequential damages, so the above limitation or exclusion may not apply to you. This warranty gives you specific legal rights. You may also have other rights which may vary from state to state.

The warranties set forth herein are exclusive and unless otherwise required by applicable law no other warranties are made by Flowmaster® or are authorized to be made with respect to the product.

Magnuson-Moss Warranty Act:
Legally, a vehicle manufacturer cannot void the warranty on a vehicle due to an aftermarket part unless they can prove that the aftermarket part caused or contributed to the failure in the vehicle (per the Magnuson Moss Warranty Act (15 U.S.C. 2302(C)) Learn More

Product Reviews

(53)

Every Customer can leave a review about our service and the product that was purchased. In order to leave your review for your new product, please follow the link in the email you receive after completing your purchase. You can rate appearance, ease of installation, price/value and product quality.

Flowmaster® - American Thunder™ Stainless Steel Cat-Back Exhaust System (Dual Rear Exit)
Flowmaster® - American Thunder™ Exhaust System
Average Rating: 4.6 of 5
4.5
4.3 of 5
Flowmaster American Dual Exhaust System
Looks and sounds great on my Tahoe. I had an exhaust pro shop put them on for me.
JPosted by (Mason City, IA) /
2007 Chevy Tahoe
Was this review helpful for you? Yes
5 of 5
Nice Growl
The product works great, I was looking for a nice growl for my Camaro and I have it now.
PPosted by (Warrington, PA) /
2012 Chevy Camaro
Was this review helpful for you? Yes
5 of 5
Perfect!
The sound is awesome and it looks great on my FR-S.
MPosted by (Beaverton, OR) /
2013 Scion FR-S
Was this review helpful for you? Yes
4.8 of 5
Flows
Great sounding exhaust.
JPosted by (Walnut Cove, NC) /
2004 Nissan Titan
Was this review helpful for you? Yes
5 of 5
Dodge
My car before was decent had a nice stock V8 rumble to it but once I have these installed I feel like I'm driving a beast! I get so many head turns and looks and the look of the pipes coming out of the back is awesome! If you want a great growl out of your car this exhaust system is the way to go!
CPosted by (Blacksburg, VA) /
2007 Dodge Charger
Was this review helpful for you? Yes
4.8 of 5
Stealth Mode On [Off]
Nice deep, loud roar when she's on the hunt. Nice quiet purr when she's resting at idle. Easy enough install, great power gains when matched with my cold air intake! Not your typical import sound! I love the fact that the tips aren't too flashy, because while she is loud, she doesn't scream "overcompensation package". Just make sure you torque down the clamps tight enough or she'll shake herself loose.
EPosted by (Hayden, AL) /
2013 Scion FR-S
Was this review helpful for you? Yes
2 of 5
Did Not Fit The Del Sol!
This did not fit the Honda Del Sol listed! It was way too long for the car so we had to cut and weld part of the piping. Even then the canister had no more room to slide back and it was still poking out from behind the car. The hole tip was sitting way behind the rear bumper. Even if we could have got the tip to sit flush it would have still come into constant with the bumper. Horrible, we had to use the exhaust system without the tip and cut and weld in order to make it work!
EPosted by (Hyattsville, MD) /
1997 Honda Del Sol
Was this review helpful for you? Yes
5 of 5
Nice!
Looks and sounds good, not as loud as I expected but still worth the price!
TPosted by (Whiteland, IN) /
2003 Dodge Ram
Was this review helpful for you? Yes
5 of 5
Easy Installation
Easy Installation and great sound.
DPosted by (Buckeye, AZ) /
2014 Chevy Camaro
Was this review helpful for you? Yes
4.3 of 5
New Exhaust System for 1971 Doge Charger
The product installed very easily and impressed with the overall product.
MPosted by (Massillon, OH) /
1971 Dodge Charger
Was this review helpful for you? Yes
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