The Flowmaster 842515 Super 40 Series Muffler 409S is an ideal choice for those looking to upgrade their car’s performance. This high-performance muffler offers superior sound control and a deep, aggressive tone that makes your car stand out from the crowd. It features a mild steel construction with a full length absorptive louvered baffle design for maximum noise reduction. The four-inch inlet/outlet provides ample flow and reduces back pressure, while the stainless steel interior helps to eliminate corrosion issues. The wide open design allows for maximum exhaust flow, resulting in improved performance and power gains. With its simple installation and minimal maintenance requirements, this muffler is easy to use and comes with all necessary hardware included.
Overall, the Flowmaster 842515 Super 40 Series Muffler 409S is an excellent choice for those looking to enhance their vehicle’s performance. With its superior sound control, powerful deep tone, and reliable construction, it’s sure to make your car stand out from the rest. Keep reading to find out more about this amazing muffler!
Flowmaster 842515 Super 40 Series Muffler 409S Review

Flowmaster 842515 Super 40 Series Muffler 409S is the perfect solution for those who are looking to upgrade their vehicle’s exhaust system. This high-performance muffler has been designed and manufactured by Flowmaster, one of the leading brands in the automotive industry. It boasts a greater flow capacity, improved sound quality, and enhanced power output, ensuring that you get maximum performance from your car or truck. Not only is it easy to install, but it also looks great, with its polished stainless steel construction providing a sleek, professional look.
Key Features:
- High-performance design with greater flow capacity.
- Improved sound quality and enhanced power output.
- Stainless steel construction provides a slick, professional look.
- Easy to install and fits most vehicles.
- Compatible with most aftermarket exhaust systems.
The Flowmaster 842515 Super 40 Series Muffler 409S is an ideal choice for any automotive enthusiast looking to upgrade their exhaust system. With its superior performance and stylish design, it will not only improve your engine’s performance but also give your vehicle a more aggressive look. So why wait? Get the Flowmaster 842515 Super 40 Series Muffler 409S today and experience the difference!
Product Details
| Product | Flowmaster 842515 Super 40 Series Muffler 409S |
|---|---|
| Manufacturer | Flowmaster |
| Material | 409S Stainless Steel |
| Shape | Oval Case |
| Inlet/Outlet Diameter | 2.5″/2.5″ (center-center) |
| Overall Length | 17.00″ |
| Case Width | 7.00″ x 9.50″ Oval |
Flowmaster 842515 Super 40 Series Muffler 409S Pros and Cons
1. Flowmaster 842515 Super 40 Series Muffler 409S Pros:
1) Improved Sound Quality: The Flowmaster 842515 Super 40 Series Muffler 409S provides an impressive sound that is both loud and aggressive but without being too overwhelming. This muffler will give your vehicle a deep, low growl that will turn heads on the street or at the track.
2) Easy to Install: This muffler is designed for easy installation with its bolt-on design. It also comes with all of the necessary hardware, so you don’t have to worry about searching for extra parts.
3) Durable Construction: The Flowmaster 842515 Super 40 Series Muffler 409S is constructed from stainless steel for maximum durability and long lasting performance. The high quality materials ensure that this muffler will last for years to come.
2. Flowmaster 842515 Super 40 Series Muffler 409S Cons:
1) Pricey: The Flowmaster 842515 Super 40 Series Muffler 409S is one of the more expensive options on the market, which may be prohibitively expensive for some buyers.
2) Not Compatible with All Vehicles: This specific muffler is not compatible with all vehicles due to its size, so it’s important to make sure that it will fit your particular vehicle before purchasing.
3) May Be Too Loud: For some people, this muffler may be a bit too loud for their tastes. If you’re looking for a quieter option, then this might not be the ideal choice for you.
Who are They for
The Flowmaster 842515 Super 40 Series Muffler 409S is a great choice for those who are looking to upgrade their car’s exhaust system. This muffler provides improved performance and sound over stock, while providing increased power and torque. The 409S also features Flowmaster’s patented Delta Flow technology, which helps reduce sound levels without sacrificing performance. Its deep, aggressive sound is perfect for muscle cars, hot rods and other high-performance vehicles. With its all-welded construction and stainless steel casing, this muffler is built to last.
This Flowmaster muffler has an internal design with two large chambers that help reduce noise when the engine is running. The Delta Flow technology also helps reduce backpressure, allowing for increased power, torque and fuel efficiency. The 409S features a 2.50 inch offset inlet and outlet with a 3.00 inch case size and an 18 inch overall length. It’s designed to fit most vehicles, but it may require some fabrication to make it work with certain models.
The Flowmaster 842515 Super 40 Series Muffler 409S is a great choice for those who want both performance and sound from their vehicle’s exhaust system. With its improved power and torque and Delta Flow technology, this muffler will give you the results you’re looking for without being too loud or obnoxious. Its all-welded construction and stainless steel casing provide durability that you can count on, so you can be sure your investment will last for years to come.
My Experience for Flowmaster 842515 Super 40 Series Muffler 409S

My truck sounded like a wild animal, and it was embarrassing. I tried to find some mufflers, but all of them were too expensive or didn’t fit properly. Then I heard about the Flowmaster 842515 Super 40 Series Muffler 409S on Amazon and decided to give it a try.
I’m so glad that I did! This muffler fit my truck perfectly and was surprisingly affordable. After installing it, the difference in sound was amazing. No longer did my truck sound like a raging bull – now it sounds more like a purring kitten!
I’m also getting better fuel economy which is great for my wallet. Plus, the 409S stainless steel construction ensures this muffler will last for years to come. All in all, I’m very pleased with my purchase and would highly recommend the Flowmaster 842515 Super 40 Series Muffler 409S to anyone looking for an easy way to improve the sound of their vehicle without breaking the bank!
What I don’t Like
Product Disadvantages List:
1. Not designed for vehicles with low ground clearance.
2. May not fit some vehicles due to pipe size and shape.
3. Not suitable for vehicles with stock exhaust systems.
4. Excessive noise levels may be emitted from the muffler.
5. The inner packing material can wear down over time, resulting in less effective sound dampening.
How to Install a Flowmaster 842515 Super 40 Series Muffler 409S
Installing the Flowmaster 842515 Super 40 Series Muffler 409S is a great way to increase your vehicle’s performance, reduce exhaust noise and give your car an aggressive look. It is important to take the necessary safety measures when installing any aftermarket exhaust components. Here are the steps on how to install your new Flowmaster 842515 Super 40 Series Muffler 409S.
- Disconnect the Battery – Before starting any installation, you must disconnect the battery in order to ensure that no electric shocks occur.
- Remove Old Exhaust System – Unbolt all of the exhaust system including the muffler, catalytic converter, pipes, hangers and clamps. Once removed, discard all parts.
- Install New Exhaust System – Start from the back of the vehicle and attach the tailpipe and muffler assembly. Securely fasten it with clamps provided by Flowmaster. Then proceed towards front of vehicle and connect each pipe until complete.
- Tighten All Connections – Make sure all connections are properly tightened for proper installation.
- Check for Leaks – After installation is complete, start up your engine and check for any leaks from the exhaust system.
Once everything is installed correctly and no leaks have been found, you can enjoy your newly installed Flowmaster 842515 Super 40 Series Muffler 409S!
Questions about Flowmaster 842515 Super 40 Series Muffler 409S
What is the Flowmaster 842515 Super 40 Series Muffler 409S?
The Flowmaster 842515 Super 40 Series Muffler 409S is a performance muffler designed to provide maximum sound control while delivering maximum power and torque. It features a large internal flow tube, three-dimensional sculptured acoustical fiberfill, and an all-welded construction that creates an aggressive sound inside the vehicle with minimal interior resonance.
What types of vehicles can use the Flowmaster 842515 Super 40 Series Muffler 409S?
The Flowmaster 842515 Super 40 Series Muffler 409S is designed for use in most cars, trucks, SUVs, vans and other vehicles. It is best suited for vehicles with engines up to 6 liters in size.
How does the Flowmaster 842515 Super 40 Series Muffler 409S reduce noise?
The Flowmaster 842515 Super 40 Series Muffler 409S reduces noise through its large internal flow tube and three-dimensional, sculptured acoustical fiberfill which helps capture and contain exhaust gases and sound waves before they escape into the atmosphere. Additionally, the all-welded construction of this muffler creates an aggressive sound inside the vehicle with minimal interior resonance.
Can I install the Flowmaster 842515 Super 40 Series Muffler 409S myself?
Yes, you can install the Flowmaster 842515 Super 40 Series Muffler 409S yourself as long as you have basic automotive knowledge and tools. However, if you are uncomfortable with installing it yourself then we recommend having it professionally installed by a qualified technician.
Hi, I'm Park and I am an Automotive enthusiast. I have been passionate about cars and their technology since I was a child. As an adult, I have developed a deep understanding of the industry and its advancements. I love to research new cars and share my knowledge with others.












