Flowmaster American Thunder Exhaust System

Flowmaster American Thunder Exhaust System

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  • Flowmaster American Thunder Exhaust System
  • Flowmaster American Thunder Exhaust System
  • Flowmaster American Thunder Exhaust System
  • Flowmaster American Thunder Exhaust System
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List Price: $233.08 - $2,471.41

$194.23 - $2,059.51

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Let your ride be heard like "thunder" with the Flowmaster American Thunder Exhaust Systems! This exhaust system was specially created for the enthusiast who wants their ride to be heard.

The Flowmaster American Thunder is crafted from 16-gauge stainless steel for maximum durability, with every exhaust system mandrel bent for a smoother exhaust flow. It is designed with the latest technology that provides for passing power, enhanced acceleration, and better fuel economy. The American Thunder Exhaust System gives the same Flowmaster sound in either single or dual mufflers.

The Flowmaster American Thunder exhaust systems come with an aggressive sound. This exhaust system is easy to install, so don't wait! For improved performance, Flowmaster has you covered.


  • Deep aggressive tone
  • Chambered muffler system
  • Delivers more power, torque, throttle response, and mileage

Flowmaster was founded in 1983 by Ray Flugger in California. It was conceived to be a solution to the growing problems with sound issues at race tracks in California. Flugger refused to accept the status quo of the day and instead pushed the exhaust technology past common thinking. On the way to numerous firsts in the exhaust science of automotive and numerous patents to protect the different technologies used in Flowmaster products. It ushered a revolution in automotive performance exhaust.

The company has two locations with a combined area of 400,000 square feet or 37,000 square meters in Santa Rosa, California, and West Sacramento, California. Flowmaster was manufactured to minimize the California Sprint Car engine noise without the need to sacrifice its performance from extreme back pressure produced by the traditional exhaust systems. From then, Flowmaster became a manufacturer of performance exhaust systems, mufflers, exhaust kits, racing mufflers, stainless steel mufflers, and exhaust accessories for muscle cars, cars, trucks, diesel trucks, SUVs, motorhomes, and most vehicles.

Ray Flugger was the private owner of Flowmaster until 2010 when it was acquired by the B&M Group and now are with three other automotive parts companies, the B&M Racing, Hurst Shifters, and the Hurst Driveline Conversions.

Flowmaster's mission has always been to convey to you the highest quality of exhaust products through advanced manufacturing experience, innovation, and dedication to customer service and satisfaction. Now, they are taking that mission statement to a higher level, by presenting exciting new product categories that enhances their exhaust offerings. Launching the "Delta-Boost" tuners for those turbo-charged applications and "Delta Force" cold air intake systems for a number of late model applications.

Now, deep into the 21st century, Flowmaster continues to endorse modern technologies in the automotive industry, as it continues to convey excellent sound and performance benefits to almost all types of vehicles from the legendary chambered mufflers to the laminar flow designs. They frequently introduce new products and applications, from mufflers to high-performance headers, flow catalytic converters, tuners, cold air intake systems, and a full line of carefully engineered bolt-on exhaust systems. With the continuous advancement of automotive technology, their dedication to creating the newest and best performance products become stronger than ever. When it comes to exhaust products, Flowmaster is the name you can trust.

Warranty Information

Flowmaster's Lifetime Limited Warranty applies to Flowmaster stainless steel mufflers (excluding FlowFX series), all stainless steel exhaust systems (including FlowFX series), stainless steel pipes, air intake kits and oiled type filters (except cleaning kits), and other stainless steel exhaust accessories (except exhaust tips and racing products).

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.

Two (2) Year Limited Warranty applies to "Delta Force" Dry air intake filter elements.

One (1) Year Limited Warranty applies to FlowFX series mufflers, Elite Series exhaust headers and electronic components such as Delta Boost modules.

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, including interior/exterior sound levels, 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. Note that all "straight-through" mufflers which use sound absorbing material inside the muffler to cancel sound…will degrade over time. This degradation of sound absorbing materials is considered "normal wear"…not a material defect.

The warranty set forth herein for Flowmaster stainless steel mufflers (except FlowFX), all stainless steel exhaust systems, stainless steel pipes, stainless steel exhaust accessories (except exhaust tips) and air intake kits and oiled type filters (except cleaning kits), 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 dry air intake filter elements extends for a period of two (2) years from the date of original purchase and the original vehicle it was installed on. The warranty set forth herein for Flowmaster Exhaust headers, FlowFX mufflers, and Delta Boost modules 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 the 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.

  • Manufactured from High-Quality Stainless Steel
  • Dyno Tuned for Maximum Performance
  • With Moderately Aggressive to Deep Aggressive Sound
  • Available in Direct-Fit, Axle-Back, and Cat-Back Systems
  • Includes Hangers and Hardware for Easy Installation
  • Backed by a Limited Lifetime Warranty
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