Flowmaster Muffler Sound Chart: Loudest to Quietest [Explained & Reviewed]

Flowmaster is a household name boasting the most recognizable sound on the road. But did you know that Flowmaster offers different sound levels on its mufflers? 

From the original Outlaw to the mild Super 50, there’s a muffler to give you a hot-rod performance that matches the iconic Flowmaster sound. 

Today, I will show you the Flowmaster mufflers from the loudest to quietest.

Also, you will find a comparison of popular items at the end of the post.

Let’s get started.

Flowmaster Mufflers Loudest to Quietest

We can divide Flowmaster mufflers into three groups. The first consists of the loudest and most aggressive-sounding mufflers.

They start with the Flowmaster Outflow down to the Flowmaster 80 Series.

These mufflers are considered racing level, and some are street-legal, like the Flowmaster Super 40 and 40 Series Delta Flow.

The second group suits enthusiasts, truck drivers, and anyone with a V8 or V6 engine.

Here, you will find the FlowFX, 50 Series heavy-duty, and Pro Series, among others.

Finally, if you’re out for a muffler that brings character to your car without being too loud, the mild-sounding mufflers are suitable for you. They include the Super 50, 50 Series Big Block, and 70 series.

Want to know my review of each muffler?

In the sections below, I’m going to show you the pros and cons of each product.

Let’s go!!

Group 1: Aggressive Exterior Sound Level, Noticeable Interior Resonance

This first group of Flowmaster muffler includes 6 items (from loudest to quietest):

• Flowmaster Outlaw
• Flowmaster Super 10 
• Flowmaster Super 44 Series
• Flowmaster 40 Series
• Flowmaster 40 Series Delta Flow 
• Flowmaster 80 Series

1. Flowmaster Outlaw 

The Flowmaster Outlaw is the loudest Flowmaster Muffler. It’s a very aggressive and noticeable muffler.

And not just on the road but also inside the cabin. It has a high interior drone and resonance level, so the conversation will have to wait until you reach your destination.

To this end, this muffler is guaranteed to beat your stock headers in power production, 

At 10.5 inches long and 4-inch wide, it allows sound waves and exhaust gases to flow out easily for improved horsepower and performance. 

Get the quickest and loudest draw with the Outlaw muffler.

Designed with a round compact shape, this bad boy will announce your arrival from a mile away. Get it for your racing ride or off-road truck today. 

2. Flowmaster Super 10 

The Super 10 muffler is a single chamber muffler that is also very aggressive.

This model was created after the Delta Force race mufflers and is intended for any driver looking for the loudest and most aggressive sound for off-highway use. 

Again, the body of this muffler is very small and stout at around 6 inches in height and 4 inches in width.

The Super 10 is available for domestic V8 applications, and some imported car brands can also use this muffler. 

Finally, this model has stainless-steel plates to form a body that provides minimum sound oppression.

That’s why it’s a good pick for racing or off-road use where engine sound is a low priority. 

Boasting Delta-Flow performance technology, the Super 10 is an aggressive muffler that delivers maximum exhaust flow.

It’s ready for the race track as it is for the trail. So, if you want the loudest muffler without straight piping, Super 10 is for you. 

3. Flowmaster Super 44 Series

The Super 44 muffler is an excellent choice for drivers who want a powerfully rich tone.

It has an aggressive sound that’s deep due to the interior steel plates that form the two chambers.

Still, even with two chambers, it’s not as loud as the Outlaw or the Super 10.

Moreover, it’s street-legal, so you can install it for your daily drive. 

Since this muffler is louder than your stock muffler, you can expect to hear the resonance inside the cabin.

So, you will hear a throatier rumble, and conversation will have to be a tad louder.

Lastly, this model is available in seven different configurations making it an option for passenger cars and trucks. 

Upgrade your stock muffler with the loudest street-legal Super 44 muffler.

Every enthusiast will want to get the rich and deep sound that will make your ride a statement.

4. Flowmaster 40 Series

Flowmaster 40 Series produces a low deep rumble at idle that comes alive when you punch it.

This muffler is the loudest and most-aggressive street muffler, with considerable sound bleeding to the cabin.

However, it meets both sound and emission limits, but you still have to check local laws when you choose this unit. 

This chambered muffler has more steel plates that cause more sound oppression and a quieter engine.

The Super 40 does not improve horsepower performance even while utilizing Delta Force performance technology.

Instead, it provides sound improvement only. 

Whether you are an enthusiast or daily driver out for an aggressive muffler that won’t leave your ears ringing, you’ve got in the Flowmaster 40 series.

It takes advantage of two chambers to give you loud sound to breathe new life into your ride. 

5. Flowmaster Super 40 

Featuring Gen II Delta Flow technology, the Super 40 gives you the best of the racing and street world in terms of sound and performance.

This muffler has the same deep rumble as the 40 series but with much less drone and interior resonance. 

At only 10 pounds and constructed from aluminized aluminum, the reduced weight improves the sound.

Not to mention, the unique delta flow baffle setup allows it to produce a low and rich, throaty tone. 

The Flowmaster Super 40 sounds deeper and meaner to give you that lovely sporty sound.

It’s the bad boy of the streets, and you can pair it with a high output engine without worrying about the deafening interior drone. 

6. Flowmaster 40 Series Delta Flow 

Flowmaster 40 Series Delta Flow is the quietest among two-chambered 40 series mufflers.

It gives a deep, throaty rumble without being excessively noisy. Featuring Flowmaster’s original design, this muffler screams performance. It tune’s your car’s exhaust to produce the unmistakable Flowmaster sound. 

This muffler offers unrestricted exhaust flow to increase torque and horsepower.

In addition, it utilizes aluminized steel or 409 stainless steel for unmatched corrosion resistance.

Plus, it has a MIG welded body to improve durability. 

Flowmaster 40 Series Delta Flow provides excellent street, off-road, and strip applications thanks to its construction design. 

Flowmaster Super 40 Delta Flow is what most drivers gravitate towards.

With nearly no cabin resonance, it provides a comfortable yet powerful ride. 

7. Flowmaster 80 Series

Flowmaster 80 Series also features the original two-chamber design.

It delivers an aggressive muscle car sound inside and outside the vehicle.

You’ll agree that it brings a noticeable power increase over your stock muffler.

Not to mention, it sounds great over the entire power band and quiets down during cruising speeds.

Flowmaster 80 Series is available with single or dual outlet configurations.

It is designed for cross-flow applications and is intended to be installed transversely behind the rear end.

Hence, it’s ideal if you want to match your stock system or for increased ground clearance. 

This muffler will fit street rods, Buick Grand Nationals & T-Types, and 1982 – 2001 Camaro and Firebird V-8 applications. 

Want to get compliments about your deep and aggressive-sounding ride?

Flowmaster 80 Series gives you precisely that sound. It’s for enthusiasts and everyday drivers with a knack for a superior exhaust. 

Group 2: Moderate Exterior Sound Level, Minimal Interior Resonance 

This group consists of 7 items. They are:

• Flowmaster FlowFX Series
• Flowmaster 50 Series Heavy Duty
• Flowmaster HP-2
• Flowmaster PRO Series
• Flowmaster DBX Series
• Flowmaster 50 Series Delta Flow
• Flowmaster 60 Series Delta Race

1. Flowmaster FlowFX Series

Flowmaster FlowFX Series features a straight-through design but with a moderate tone.

This muffler gives the enthusiast a different exhaust note from what you would experience with a chambered muffler.

That said, it’s not too loud during regular cruising, but it gets aggressive when you step on it. 

Flowmaster FlowFX Series is pretty quiet in the cabin with very little resonance.

This is because it has a stainless-steel perforated core, but it’s surrounded by a high-temperature sound absorption material to deliver a classic mellow tone. 

The FlowFX series is reversible due to the internal flow design, so you can install it in either direction. 

Flowmaster FlowFX Series is for the gentleman’s muscle car. It’s for a V6 and V8 application and gives you the exact sound that you want for these engines. It roars when you get on the gas and is essentially a mild note for a very lively ride in the cabin. 

2. Flowmaster 50 Series Heavy Duty 

Flowmaster 50 Series Heavy Duty is for the most demanding applications.

As you can see, it’s a muffler for tough trucks.

Apart from producing a deep, powerful sound, the 50 Series HD significantly increases horsepower, torque, and mileage while improving towing power acceleration. 

With a large case size and 4-inch internal components, this muffler increases exhaust flow, thus reducing restrictions and backpressure. In addition, this muffler can fit both diesel and gas trucks.

Besides, it has durable 16-gauge steel construction and is fully MIG-welded to increase longevity.

Improve torque and reduce rough shifting when accelerating in your tow truck with the Flowmaster 50 Series Heavy Duty.

This muffler not only gives you a deep sound but also increases overall vehicle performance. 

3. Flowmaster HP-2 

If you own a sport truck, custom, or street rod and don’t want an aggressive sound, Flowmaster HP-2 is suitable for you.

This model pumps up your engine’s power as it blends rapid flow exhaust technology and a mellow 50’s inspired note. 

I like that this muffler unleashes a subtle but warm rumble in a straight-through design.

While simple on the outside, this muffler features an advanced interior design that eliminates unwanted noise.

That’s why you listen to a rich tone that’s only associated with classic cruisers.

Furthermore, the Flowmaster HP-2 carries cool shell cases that reduce drone sound significantly and insulate against heat.

Hence, it’s the ideal pick for lots of applications. 

If you want to pump up your power and not necessarily the volume, Flowmaster HP-2 is the muffler for your ride.

This model is suitable for street rods, sport trucks, customs, and low-riders with a compact design.

4. Flowmaster PRO Series 

Flowmaster PRO Series is a versatile muffler for lots of performance applications.

It’s popular among diesel engine owners, street trucks, RV pushers, the race track, and street use.

All thanks to a laminar flow design to deliver ground-breaking sound control. 

Flowmaster PRO Series delivers exhaust system efficiency and maximum engine power.

The series offers the standard model for street driving, while the shorty mufflers are great for muscle and performance cars. 

The Flowmaster PRO Series is the strongest muffler for a moderate sound with no baffles to restrict flow and no fiberglass packing.

It quiets an aggressive engine and is also fit for the race track. 

5. Flowmaster DBX Series 

Flowmaster DBX Series also features laminar flow technology.

Moreover, it borrows from the HP and Pro Series to deliver high-quality sound and maximum performance.

This high-flowing muffler has a patented core design with a minimal interior drone for moderate sound. 

Unlike other Flowmaster mufflers, DBX Series is perhaps the only muffler with close to no cabin resonance, but it also increases the engine’s performance.

Thus, it’s not just for the sound but also for power. 

If you want better engine performance and improved sound quality, consider the Flowmaster DBX Series.

It’s a high-quality muffler that will keep the peace inside your ride. 

6. Flowmaster 50 Series Delta Flow 

Flowmaster 50 Series Delta Pro delivers a performance growl, but you won’t be getting a scowl from your neighbors.

The muffler produces a mellow, deep sound for vehicle applications rather than SUVs and trucks. 

You can call this model the Super 50 but with more volume, because it has a thinner case and more baffles that add resonance.

It is easier to activate but is significantly quiet in the cabin.

Yet, it has the right feel and performance speed. 

Want a lovely, deep, low rumble that is pleasing to the ears inside and out?

Flowmaster 50 Series Delta Pro is the best grab.

You can expect some subtle power increase, but it’s all about the powerful sound with this muffler. 

7. Flowmaster 60 Series Delta Race 

Flowmaster 60 Series Delta Race is the ideal solution for race cars that want a tremendous boost in power and torque with maximum sound control.

While it was developed for race classes, the 60 series is still an excellent choice for V6 and V8 engines and other small displacement cars. 

This muffler features Delta Flow technology and comes in a short design to improve mileage.

The mellow tone makes for a silent driving experience.

Moreover, it follows through with a stainless-steel and MIG-welded frame for maximum durability. 

Flowmaster 60 Series Delta Race provides better performance than a stock muffler, and it’s also pretty quiet for a muffler suitable for the race track.

Hence, it fits the bill for street cruising in sport-compact cars. 

Group 3: Mild-Stock Exterior Sound Level, Mild Interior Resonance

This group includes:

• Flowmaster Super 50 
• Flowmaster 70 Series 
• Flowmaster 50 Series Big Block

1. Flowmaster Super 50 

Perfect for the daily driver, the Super 50 series features a large tuning chamber that makes it noticeably louder than your stock muffler.

Besides, it incorporates a large case size as seen in the Super 50 Series Delta Flow but is thicker to reduce interior resonance. 

The Super 50 series optimizes exhaust flow, increasing fuel mileage; that’s why it’s great for trucks, SUVs, and other large displacement vehicles.

As for the exterior sound, the muffler offers an enjoyable, deep tone that is not overbearing. 

If you want the benefits of a Flowmaster with an added performance increase, you’ll love using the Super 50 series.

It’s not loud but adds a great sound to V6 and V8 engines. 

2. Flowmaster 70 Series 

Flowmaster 70 Series uses a large case for increased volume with a deep, mild tone.

It utilizes Delta Flow technology which maximizes efficiency while minimizing interior resonance.

The muffler is ideal for high-performance street cars, RVs, SUVs, most trucks, and tow vehicles.

As for the sound level, the Flowmaster 70 series average 82.1 dB at 3000 RPMs at 30 ft. away to improve sound performance while being on the quiet side.

It is available with a stainless-steel or aluminized steel frame for 2.5-inch and 3-inch exhaust systems. 

For an increased volume with a pleasant, mellow, but beefy sound, the Flowmaster 70 Series is an ideal pick.

It’s also what you need for easier installation in tight applications since it’s narrower than the original Big Block. 

3. Flowmaster 50 Series Big Block 

50 Series Big Block is the largest and quietest Flowmaster muffler.

Therefore, it’s perfect for SUVs, full-size trucks, and RVs.

It cranks out extra power and torque, ideal for demanding applications.

This muffler is a mild version of the Flowmaster sound, meaning it will reveal your engine, but you won’t disturb your neighborhood. 

With increased engine efficiency comes better mileage performance.

Not to mention, it’s capable of dropping the under-hood temperature by up to 200°F to extend engine life.

Its well-rounded performance also covers a calm ride since it enjoys reduced interior resonance. 

For a quiet cabin with a muffler that can handle a big engine under a heavy load, go with the Flowmaster 50 Series Big Block.

From the H-chamber design to the reduced under-hood temperature, you’ll be raving about this muffler once you install it. 

Flowmaster Muffler Comparison 

Let’s compare Flowmaster mufflers side by side to give you a good idea of how these mufflers sound.

But first, take a look at this sound chart. 

Flowmaster 40 Vs. 44

The 40 series is noticeably loud inside and outside the vehicle.

Nevertheless, the 44 series is also loud and aggressive.

The primary difference is the interior resonance since the 44 has more cabin resonance than the 40 series.

Flowmaster Super 40 Vs. Super 44

The Super 44 is well known for its powerfully rich aggressive tone, ideal for street applications.

The Super 44 is significantly louder than the Super 40, suitable for high horsepower street and strip vehicles.

To this end, the Super 40 produces a more subdued sound. 

Flowmaster 40 Vs. 50 

The Flowmaster 40 series has noticeable interior resonance and an aggressive sound suitable for enthusiasts.

It is an excellent choice for street/strip and off-road applications.

On the other hand, the 50 series is quieter and ideal for large displacement vehicles. In addition, it has mild interior resonance. 

Flowmaster Super 10 Vs. 40 

Super 10 is very loud and is considered the most aggressive in the Flowmaster lineup.

This muffler is for racing applications. Meanwhile, the 40 series is generally loud, but it does not have low rumble.

Of the two, the Super 10 is louder than the 40 series. 

Flowmaster Super 10 Vs. 44 

Super 10 is louder than 44 mufflers.

While both have a deep aggressive bite to their sound, the Super 10 is less restrictive, resulting in loud sound during idle and acceleration.

The 44 mufflers are loud and ideal for street cars but remain significantly quieter than Super 10 mufflers. 

Flowmaster Outlaw Vs. Super 10

Outlaw mufflers have a straight-through design that makes them extremely loud.

In addition, they are the loudest with deafening drone sound.

The Super 10 has a slightly lower sound level, but it still has lots of interior resonance since it does not suppress sound. 

Flowmaster 50 Series Vs. 40 Series 

Both 50 Series and 40 Series mufflers are excellent for street/strip and off-road applications.

However, 40 Series mufflers are more aggressive and have a powerful exhaust tone that marks your presence on the road.

Nonetheless, the 50 Series have mild exterior sound and reduced interior resonance making them quieter than the 40 Series. 

Flowmaster FlowFX Vs. 40 Series 

The 40 series is louder and less defined than the FlowFX because the latter has a deep exterior sound and moderate interior tone.

Nevertheless, the 40 Series can cause a lot of drone sound and rumble in the cabin, depending on your vehicle. 

Flowmaster 40 Series Delta Flow Vs. Original 40 Series 

The Original 40 Series has that classic muscle car sound that is loud inside and outside the cabin.

On the other hand, the Flowmaster 40 Series Delta Flow is suitable for daily driving; hence it’s quieter and calmer on the inside. 

Conclusion 

Can you tell the difference between the loudest Flowmaster muffler and the quietest Flowmaster muffler?

I hope you do because these mufflers are pretty distinct and deliver unique sounds.

Whether you want a muffler for your race car, street rod, tow truck, or RV, you can find the perfect Flowmaster muffler from the models discussed in this post.

Go ahead and upgrade your ride with an exhaust that showcases its power. 

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