Search For Your Parts!

Easy  Auto Accessory Shopping
Interior Accessories
Performance Parts
Call for more 2014 Applications
Get Your Accessories On at
See why you should take the time to call us to save more. Gift Certificates
Get Instant $20 Savings When You Sign Up For The Newsletter Today!


Flowmaster Mufflers and Exhaust

Exhaust Systems & Tips

Flowmaster American Thunder Exhaust
American Thunder Exhaust Systems

Flowmaster Force II Exhaust
Force II Exhaust Systems
Flowmaster Exhaust Tips
Exhaust Tips

Mild Tone Mufflers

Flowmaster 50 Series Big Block Mufflers
50 Series Big Block
Flowmaster 70 Series Big Block II Mufflers
70 Series Big Block II
Flowmaster Super 50 Series Mufflers
Super 50 Series (SUV)

Moderate Tone Mufflers

Flowmaster 50 Series Delta Flow Mufflers
50 Series Delta Flow
Flowmaster 50 Series Heavy Duty Mufflers
50 Series Heavy Duty

Aggressive Tone Mufflers

Flowmaster Delta 40 Series Mufflers
Delta 40 Series
Flowmaster Super 40 Series Mufflers
Super 40 Series

Hushpower Mufflers

Flowmaster Super Hushpower Series Mufflers
Hushpower Pro & Shortie Series

Catalytic Converters

Catalytic Converters
Flowmaster Catalytic Converters


About The Company

Company Profile:

Flowmaster is a manufacturer of performance exhaust systems, mufflers, exhaust kits, racing mufflers, stainless steel mufflers, and exhaust accessories for cars, trucks, diesel trucks, SUV's, ATVs and most vehicles. What makes Flowmaster so unique is that its performance improvement is paired with Flowmasters unique exhaust tones. Flowmaster exhaust systems and mufflers come with that distinctive "Flowmaster sound" available in mild, moderate and aggressive tones.

Contact Info

Flowmaster, Inc.
Flowmaster, Inc.
100 Stony Point Rd.
Suite 125
Santa Rosa, CA 95401

Frequently Asked Questions

1. What makes Flowmaster mufflers different?
Flowmaster’s patented “chambered” design is what sets it apart from any other muffler. The theory behind the design is based on basic principles of physics. By splitting the exhaust stream (exhaust pulses & sound energy) and then recombining them in another chamber, the collision of energy cancels the sound waves which creates a low pressure area in its place. This resulting low pressure area then helps scavenge/accelerate the following pulses into the muffler and out the tailpipe resulting in a more efficient and cleaner burn, which means more power.

2. How does Flowmaster compare to straight thru mufflers?
Straight through mufflers consist of a perforated flow tube, and rely on packing materials such as steel wool or fiberglass to simply absorb sound. While these mufflers may improve performance by using larger internal flow tubes, the packing materials will burn or blow out over time which results in an increase of sound until it eventually becomes ineffective. The Flowmaster design uses no packing, and therefore will maintain its sound control over the life of the product.

3. How do Flowmaster mufflers rate on a flowbench (CFM)?
Many muffler manufacturers advertise, test and rate the performance of their mufflers with the use of a flowbench. The problem with this methodology is that a flowbench produces a steady, low temperature stream of air and lacks the acoustical and thermal dynamics that are produced by an internal combustion engine. Flowmaster designs, tests, and proves it’s products under real world conditions in the dyno cell, at the track and on the road; After all, when was the last time you raced a flowbench?

4. What does a Flowmaster sound like?
The Flowmaster sound is unique to itself and is very different from that of glass packs or other packed style mufflers. The Flowmaster sound can best be described as a deep smooth sound and has proven to be the preferred and most recognized sound of most automotive enthusiasts. Flowmaster offers many different levels of sound from mild, to moderate, to aggressive. In general, the 60 series, 70 Series and Super 50 Series mufflers are milder with reduced interior sound. The 50 Series Delta Flows are moderate, and the 40 Series have a more aggressive tone.

5. What is the difference between a 40 series and a 50 series muffler?
The 50 series (moderate to mild) incorporates an internal tuning chamber that helps reduce interior sound level in the cab area of your vehicle, and provides a slightly milder exterior tone than the 40 series. The 40 series (aggressive) will generally resonate or “drone” inside the vehicle, around 1800-2000 rpm and again, around 2400-2600 rpm. The performance characteristics of the 40 and 50 series are the same, so it’s simply “a sound decision”.

6. How do I select the correct Flowmaster?
The sound of your exhaust is much like music; we all have different preferences so it’s important that the system be “tuned” to what you like. With the Flowmaster family of products we can help accomplish this by answering the questions below. This approach will allow you to choose the best product to suite your needs and expectations.
1. What is the vehicle year, make, model?
2. Which engine do you have or how much horsepower does it produce?
3. How is the vehicle used? ie: daily driver, race, towing etc.
4. Preferred sound levels (interior and exterior?)
5. How are the space requirements?
6. Would you like a complete exhaust system or universal pipe kit if available? Single or dual outlet?

7. Will I lose power going from a 40 series to a 50 series, or to a 70 series?
No. Flowmaster engineers have designed each series of mufflers with maximum efficiency in mind. The differences between the various muffler series are in the varying sound levels produced both inside and outside your vehicle. This is why it is so important to take the time to carefully choose the right product that will suit your individual needs and sound preference.

8. What is “Delta Flow” technology?
This patented new technology is an improvement over the original Flowmaster design that provides improved scavenging and additional reduction of resonance inside the vehicle. This advancement was born out of Flowmaster’s extensive involvement in racing and its commitment to Research & Development. This new design incorporates additional delta deflectors placed at precise angles and spacing within .004 “ tolerance. The result is improved performance while maintaining a pleasant tone, both inside and outside the vehicle.

9. What is Hushpower?
Hushpower is the latest generation in the Flowmaster® family of performance products and its patented technology is entirely different than that of the traditional Flowmaster chambered design. Although it does utilize a packing material, it is unlike traditional straight through mufflers. The Hushpower® design features a perforated dual taper inner core which addresses two separate but related mediums: sound wave energy and exhaust flow energy. The multiple angles of the inner core have been carefully engineered to reflect a portion of the sound wave energy passing through the muffler, and redirect it toward specific areas for absorption and cancellation. Additionally, enhanced exhaust airflow is achieved by an effect referred to as Controlled Laminar Flow. This effect actually accelerates the exhaust flow as it passes through the tapered core and expands into the large volume outer core area in multiple layers. This all adds up to a design that delivers distinct torque and horsepower improvements over straight through designs, along with a deep mellow exhaust tone. Developed by Flowmaster’s Advanced Technology Group, Hushpower is truly the most revolutionary advancement in exhaust technology in 20 years.

10. What kind of performance gains can I expect when installing a Flowmaster system on my vehicle?
Performance gains will vary dependent upon your application. The more power the vehicle makes, the bigger the gains will be. Generally in full size vehicle applications, a 5-7% gain of power is fairly typical, while 1-2 mpg can be achieved. That is if you can keep your foot out of the gas to hear that Flowmaster sound.

11. What size exhaust tubing should I use for my street application?
The size of tubing used in an exhaust system is a critical item to consider. Tubing diameter will affect the sound level and performance characteristics of the muffler, but keep in mind that bigger is not always better. Using tubing that is too large can actually hinder exhaust scavenging by slowing the velocity of exhaust pulses in the tubing. As a rule, most stock street applications (dual exhaust) use 2.00” through 2.25” tubing, and modified street applications will generally use 2.25” or 2.50” tubing. Very rarely will 3.00” tubing be used for street applications. In general, the following guidelines should be applied for street applications.

2.00” tubing up to 100 hp per pipe
2.25” tubing up to 160 hp per pipe
2.50” tubing up to 250 hp per pipe
3.00” tubing up to 300 hp per pipe

12. Do I need to install an “H” pipe in my dual exhaust system?
Flowmaster strongly recommends using a crossover tube, otherwise known as an “H” pipe or balance pipe on all true dual exhaust systems. The crossover pipe equalizes the exhaust pulses and allows the sounds waves to communicate between both banks of the engine. Not only does this usually improve torque in the low to mid rpm range, it also creates a deeper mellower tone both inside and outside of the vehicle and helps eliminate “back-rap” on deceleration.

13. Is an “X” pipe better than an “H” pipe?
Over the years, Flowmaster has performed extensive testing of all types of crossovers and “X” pipes, and has revealed no substantial benefits of one over the other in street applications. We have experienced that some specialized race applications such as small cubic inch engines and /or restricted (small bore) carburetors, will respond well to the addition of an “X” pipe over an “H” pipe.

14. Will my late model vehicle run better if I replace the single inlet muffler with a true dual exhaust system?
Flowmaster does not recommend replacing factory single inlet exhaust systems with a “true dual” system on computer controlled vehicles. The computers in most late model vehicles may not be able to compensate with the fuel needed when increasing the exhaust flow, and may void your factory warranty and emission compliance. Flowmaster’s dual outlet kits will give you the look of a “true dual” system, while optimizing the vehicles performance.

15. Do I need to run tailpipes after the mufflers?
Yes, Flowmaster highly recommends running a minimum of 12” tailpipe after the muffler. This will not only greatly help in sound control; it will also provide an increase in exhaust efficiency (more power). Running tailpipes out from under the car in street applications will also direct the potentially harmful exhaust fumes away from the vehicle, as well as minimize the sound transmitted into the cab area of the vehicle.

16. What is Flowmaster’s warranty?
All Flowmaster aluminized products have a 3 year limited warranty against defective materials and workmanship (excluding race products), and a 10-year limited warranty on Stainless Steel products. All warranty related returns must be processed through original retail outlet with original sales receipt. See Page 119 for full details.

17. How can I be sure that I’m buying a Flowmaster muffler?
The Flowmaster name is embossed in every muffler case that Flowmaster builds. If it doesn’t say Flowmaster on the case, it’s not a real Flowmaster muffler. Buyer beware; Flowmaster knock-offs may look similar, but may not perform or sound the same, and often have a high defect return rate.

18. What materials are used to build Flowmaster mufflers?
All Flowmaster chambered products are fully mig welded and built from either 16 gauge aluminized steel or T409 stainless steel for durability and value. Specific part numbers of the 40 and 50 series are offered in T409 stainless steel. The Off-Road mufflers are constructed from 14 gauge diamond plate for outstanding off road durability. Hushpower mufflers are offered in exterior case finishes of T409 stainless steel, ‘polishable’ T304 stainless steel or aluminized mild steel. The internal construction of all Hushpower mufflers is T409 stainless steel.

19. Is Stainless Steel, a better material for manufacturing exhaust products than Aluminized Steel?
Not necessarily. Through years of testing under street and racing conditions, we’ve found in many applications aluminized steel is just as durable as stainless steel at a reduced cost. The problem with currently available stainless steel mufflers is that the internal “glass-packing” material will “burn-out” and not last as long as the stainless steel case they’re wrapped in, so you can end up spending a lot more money for a shiny product with a short lifespan.

20. Will installing a Flowmaster cat-back exhaust system void my vehicle’s factory warranty?
There are some modifications that have the potential to void a vehicles factory warranty, but modifying the exhaust system after the catalytic converter is not one of them. All Flowmaster exhaust systems are designed vehicle specific and do not violate manufacturers factory warranty. If you’re having problems regarding this issue, please contact for more information regarding consumer’s rights on performance aftermarket parts.

21. Are Flowmaster Performance cat-back exhaust systems and mufflers street legal?
Flowmaster has eleven families of performance mufflers, including the Hushpower performance family of mufflers allowing customers the opportunity to choose a FLOWMASTER signature sound ranging from Mild, Moderate and Aggressive to accommodate the customer’s local and state laws.