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Muffler Selector (For race applications see our Race Mufflers section)

Vehicle Type*
Sound Level*
Muffler Type*
Inlet Diameter (in)
Inlet Position
Outlet Diameter (in)
Outlet Position

When selecting a muffler there are a few things you should take into consideration.

What type of vehicle are you choosing a muffler for?

The chassis type and layout of the vehicle can limit the choices you have in mufflers. Check the area where you will be mounting the muffler first to make sure you have enough room for the muffler you decide to go with. Vehicles with large cabin areas like SUVs or hatchbacks can be more susceptible to interior sound, or drone, when an aggressive muffler is chosen.

What engine size do you have?

Engine size and power output have a big effect on the sound level. On large displacement and high horsepower engines, larger mufflers will control sound better. Smaller displacement engines will sound less high pitched and buzzy when a more moderate or mild muffler is used.

How is the vehicle used?

For daily drivers and vehicles used for towing, we typically recommend a moderate or mild muffler. These mufflers will help control the interior sound level better than the aggressive mufflers during long drives or when towing a trailer. These mufflers will offer the same performance benefits as the more aggressive mufflers, but they will also control the overall sound level better.

Do you want to hear the muffler all the time, or just when accelerating?

The moderate and mild mufflers will give you a good performance tone when accelerating on the outside of the vehicle, while keeping the sound level more in check on the inside of the vehicle. The aggressive mufflers will not only be louder on the outside, but louder inside the vehicle as well and often have a noticeable drone when driving at part throttle.

Muffler Types


Chambered mufflers use deflectors inside the muffler to split the soundwaves and direct them back into themselves on the backside of the deflectors. This collision cancels out certain sound frequencies without the need for packing or absorption material. Because of the lack of packing material, chambered mufflers do not get louder over time. Chambered mufflers have a raspy tone to them. One and two chamber models will be aggressive inside and outside of the vehicle. These models will also have interior drone. Drone is that sound resonance inside the vehicle that can be described as a constant hum when driving at part throttle. Three chambered mufflers will add additional chambers with tuning tubes to help cancel out those frequencies. These three chamber designs keep the interior sound level down and reduce the exterior sound level, with the same tone and performance as the smaller one and two chamber designs. The three chamber mufflers are typically used on tow vehicles and SUVs where interior sound level is a factor.


Absorption and Glasspack style mufflers use a perforated inner flow tube that is wrapped in a fiberglass blanket to absorb the sound frequencies as they pass through the muffler. These types of mufflers will have a traditional deep performance tone to them. These mufflers will typically have less interior drone than the one and two chamber mufflers.

Laminar Flow

Laminar Flow mufflers use a newer technology that combines traits of both Chambered and Absorption style mufflers. They have a sound that is similar to a deep sounding absorption style muffler, while using sound cancelling technology that is similar to the chambered mufflers. These mufflers have a heat absorption material inside that keeps the exterior much cooler than other mufflers and are great for tight space applications.


Turbo mufflers have perforated tubes, similar to absorption style mufflers, which direct the exhaust pulse in an “S” pattern inside the muffler. This creates a deep performance tone that is more on the moderate side in terms of sound level, but is still similar to the absorption style mufflers.


Reflection style mufflers, like the Flowmaster Outlaw and Outlaw II designs, are primarily used in racing applications. The reflection style mufflers use specifically placed “rings” inside the muffler that provide the sound attenuation. There is no fiber packing used to absorb sound. These mufflers provide minimal sound reduction, and are intended primarily for situations where a muffler rule is effect, with no specific decibel requirements.

How to measure for a muffler

When measuring the pipe size on your vehicle, it is important to be sure that you are measuring in the correct locations. Do not just measure the exhaust tip at the back of the car. Often times the manufacturer has added a larger tip to make the exhaust pipe look bigger. You will want to measure the outside diameter of the inlet pipe and the outlet pipe at the muffler. You want to measure both sides since some manufacturers do use different size pipes before and after the muffler. Take note of the inlet and outlet positions. If you are using the factory pipes, you will want to select a muffler with the same inlet and outlet configuration as the stock muffler. Also, keep in mind that in many applications, especially full size trucks, the factory muffler will be longer that the aftermarket muffler you choose. Because of this, you will need to supply some additional pipe to make up the difference in overall muffler length.

  • Flowtech Exhaust x
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  • In Stock
Muffler Type
  • Absorption / Glasspack
  • Chambered
  • Turbo
Vehicle Type
  • 4/6 CYL Engine
  • Classic Muscle Car
  • Late Model Muscle Car
  • Street/Strip
  • Street Rod
  • Truck/SUV
Inlet Diameter (in)
  • 2
  • 2.5
  • 2.25
  • 3
Inlet Position
  • Center
  • Offset
Outlet Diameter (in)
  • 2
  • 2.5
  • 2.25
  • 3
Outlet Position
  • Center
  • Dual
  • Offset
Body Length (in)
  • 13
  • 15
  • 18
Overall Length (in)
  • 16
  • 17
  • 19
  • 24
  • 32
Sound Level
  • Aggressive Sound
  • Moderate Sound
  • No
  • Yes
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    Improve the sound and performance of your ride with Hooker, Flowtech or Flowmaster mufflers! Choose from various styles including; turbo, chambered or glass pack styles in multiple configurations.