Flowmaster 40 VS 50 Series Muffler

Flowmaster 40 VS 50 Series Muffler

Ever wonder what your car would sound like without its muffler? Probably not; without it, your vehicle won’t possibly sound like the trademark exhaust tone we are used to that makes us aware of a car approaching. The sound that your vehicle emits through its muffler says a lot.

Where loud rust full sound indicates your vehicle is not in good shape, the smooth, aggressive sound suggests how powerful the car interior is. As drivers and passengers, we don’t want too loud of noise that takes aback the rest of the environment. We are looking forward to a quiet yet loud enough exhaust that blends in and suits the outer appearance of your vehicle.

Flowmaster 50 Vs 40 Table

Model: Flowmaster 430402

Model: Flowmaster 942551

Noticeable interior resonance

Mild interior resonance

Comes With Fully Mig-welded For Maximum Durability

Improved Horsepower, Torque and Engine Efficiency

Aggressive Sound for the Enthusiasts

Excellent choice for large displacement vehicles

Excellent Street/Strip and Off Road application

Excellent Street/Strip and Off Road application

High performance Flowmaster muffler

Features advanced three-chamber design

Fully MIG welded for durability

Delta Flow internal technology

Come with limited lifetime warranty

Come with limited lifetime warranty

Why Compare?

Flowmaster 40 and 50 series have been in consideration for quite a long time when choosing a suitable muffler for your car. Fifty are considerably milder than the 40s. But then again, we are looking for loud noise but not too loud. However, cruising and power are the main factors that differentiate these two exhaust systems.

Mild To Moderate Exhaust Tone

The two-compartment 50 series muffler has a range that provides tone consistently from mild to moderate. Unlike the 40 series, the 50 muffler is known for its milder exterior and reduced interior resonance due to less vibration.

On the other hand, the 40 series is rather aggressive. It has a powerful and truculent exhaust tone that marks your presence among the crowd on the road.

Decreased interior Resonance

The Flowmaster 50 series also works as sound deadeners. It secures a quitter inner ambiance by shoving out the noise in the outer world. Since the tone is still moderate, it doesn’t entirely interrupt the external balance but evaporates.

Similarly, the Flowmaster 40 too has a noticeable improvement in the reduction of interior resonance. It isn’t very pleasant outside while offering a lot quieter inside.

Ideal For Street Cars And Trucks

The 50 Flowmaster mufflers are 16 gauged 409s stainless steel and are MIG welded for optimized durability. Since it is stainless, it is very neutral to exterior moisture and goes a long way. The trucks and regular passenger cars are constantly in motion under low maintenance, 50s will be an excellent choice.

On the contrary, the aggressiveness of the 40 series allows them to cope with street and strip styles. The Flowmaster 40 mufflers are perfect for undiscovered rural places since they work great off-road.

Improved Mileage

Since 50 series are made out of the best raw steel, the ride with these is pretty smooth. Thus, the fuel combustion is reduced, resulting in improved horsepower. The low consumption and effortless mild exhaust eventually lead to better mileage.

40 series has no internal packing to the blowout. It is the most aggressive-sounding muffler in its class that is excellent for street racing and off-road applications.

Race Proven

On a brighter note, the Flowmaster 50 muffler series is limited to daily use. The dual chamber gives it a modern look that copes well with the race car vibes. It allows the outer appearance to be challenging, yet the sound is subtle enough not to draw inconvenience.

One of the most significant differences between the 40 and 50 series is that, while 50 are suitable for regular cars and trucks on the concrete road, the 40s are more of a rebel version which is a complete match for racing. Its head-turning thunder-like tone will surely make you look more challenging.

Vehicle Specific: 

Where 50s are vehicle specific, the oval-shaped 40 Flowmaster comes along with the quality of universal fit.


Even though the Flowmaster 40 and 50 series are supposed to mimic the output of a sound deadener, reportedly, they are not quite good in that sector. The job of the mufflers is not only to emit exhaust noise but also to provide an overall service. Nevertheless, they seem to prove less adequate.

While many users find it up to their liking, on the contrary, many have opposed the recommendation of the 50s. “Delta flow seems to have more baffles and less resonating,” states some consumers.

 Which One Is The Loudest?

As you might have already guessed, the answer is “Flowmaster 40 series”. By a considerable margin, these series are known for their trademark loud, thunder-like noise that will surely make people turn their heads.

 Is Flowmaster Louder Than Glasspacks?

The Flowmaster is better right off the bat. Flowmaster, 40 series mufflers, provide the most profound and powerful grumble that almost sounds angry and threatening.

Our Observation

The 50 series Flowmaster is an excellent choice for those who want a mild exhaust tone that is still noticeable, while the 40 series is better for those who want a more aggressive sound. However, both mufflers are good at reducing interior resonance and improving mileage. It is important to note that the 40 series is more aggressive sounding and may not be suitable for regular street driving. Race cars and off-road vehicles will benefit the most from the 40 series Flowmaster.

Frequently Asked Questions (FAQ)

Yes, the Flowmaster 50 Series is quite loud. It’s designed to produce a deep, aggressive sound that will turn heads when you hit the gas. If you’re looking for a muffler that will really make your car stand out, this is the one for you. But be warned – it’s not for everyone. If you’re looking for a quiet ride, you might want to look elsewhere. But if you want to make a statement, the Flowmaster 50 Series is a perfect choice.

The answer to this question largely depends on the type of truck you have. Some trucks are naturally louder than others, and adding a Flowmaster exhaust system may not make much difference. However, if you have a quiet truck, adding a Flowmaster could make it noticeably louder. It really just depends on the vehicle.

Mufflers don’t actually increase gas mileage, but they can improve your engine’s efficiency, which can lead to better fuel economy. A well-designed muffler can also reduce noise, making your car more pleasant to drive.

Flowmasters are a popular brand of exhaust systems, and many people wonder how much horsepower they can add to a car. The answer depends on the specific Flowmaster model and the car it is being installed on. Generally speaking, Flowmasters can add 5-10% more horsepower to a car. This means that if your car has 100 horsepower, a Flowmaster could potentially increase that to 110 horsepower. Of course, other factors like engine size and modifications will also affect the final horsepower number. But if you’re looking for a way to boost your car’s power, Flowmasters are definitely worth considering.



Flowmaster 40s and 50s are different versions of these models under the same brand. They both have an average decent rating of 4.8 stars out of 5. With both of them addressing different affairs, they are indeed distinct, by all means, you can settle for one of them according to your need.

Flowmaster 40

Flowmaster 50

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