Motorcycle Exhaust Baffles Buying Guide

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Motorcycle Exhaust Baffles Buying Guide

Exhaust baffles come in a variety of styles, diameters, and lengths, depending on the design of the exhaust pipes on a motorcycle. Getting the proper exhaust baffle for the muffler or silencer on a motorcycle is essential for the baffle to operate as intended. Understanding the purpose and function of an exhaust baffle is important to motorcycle owners. Knowing how to remove and install baffles can help make sure that the baffle is intact and functioning as designed. Motorcycle owners should be aware of the laws regulating the use of exhaust baffles throughout the United Kingdom in order to be sure that their bikes conform to regulations and are street legal.

Exhaust baffles can be purchased from motorcycle dealers, motorcycle parts stores, specialty shops, and swap meets. Motorcycle repair shops often sell baffles to fit a variety of pipes. Sellers on eBay also offer a good selection of motorcycle exhaust baffles at competitive prices. The convenience of shopping on eBay makes it a place for busy consumers to consider when making a purchase.

The Purpose and Function of Motorcycle Exhaust Baffles

The purpose of motorcycle exhaust baffles is twofold: to quiet the exhaust noise produced by the engine and to provide back pressure towards the engine to help it run as designed. The function of exhaust baffles is to route the exhaust coming out of the engine through a chamber that accomplishes the task of reducing noise and maintaining the back pressure.

Noise Reduction

Baffles have a series of holes in them that the exhaust gases must pass through. With a baffle installed in the exhaust pipe or silencer of a motorcycle, the flow of exhaust gases out of the end cap of the exhaust is slowed and sound waves are altered. This disruption of the flow changes the tone of noise produced by the engine's release of exhaust. Depending on the shape and design of the holes in the baffle, it can minimise slightly or greatly reduce the sound of exhaust noise. Motorcycle owners often choose a baffle design that produces the type of throaty roar they want associated with a bike.

Wool and Fibreglass Cloth Baffle Wraps

Cloth made of wool or strands of fibreglass is often used to wrap the baffle before it is installed in the exhaust pipe or silencer to further reduce the noise factor of an exhaust. In residential areas with strict noise reduction statutes, a wool baffle wrap may be required to meet local noise regulations. Wrapping the baffle can produce a significant reduction in measurable decibels being emitted out the end cap of exhaust pipes.

Back Pressure

Motorcycle enthusiasts debate the pros and cons of back pressure with a great deal of passion. It is a fact that a properly tuned engine can achieve maximum performance without any back pressure being applied by the exhaust; however, the instances where a motorcycle owner can ride a bike without exhaust baffling are few. Stock motorcycles come with baffles installed during the build process and are tuned accordingly. Riders can remove the baffles for short rides when the opportunity presents itself and gain some extra horsepower at certain RPM ranges. Reinstalling the baffles returns the performance to the manner in which the bike was originally tuned. Lack of back pressure on a motorcycle engine tuned for baffle usage can produce changes in engine idle, reduce low RPM throttle response, and hamper acceleration performance.

UK Motorcycle Baffle Laws

It is illegal to operate a vehicle with an internal combustion engine without the use of an exhaust system that has a silencer attached to it. It is also the owner's responsibility to make sure the silencer is maintained and in proper operating condition. Furthermore, motorcycles are specifically regulated; the silencer must be stamped with the British Standard Marking that indicates it has been tested and passed current regulatory standards, or the silencer output is not to exceed 73 decibels.

Replacing Exhaust Baffles

If a motorcycle exhaust is beginning to sound louder than normal, it is advisable for the owner to remove the baffles from the silencer and inspect them for rust and deterioration. The process may vary somewhat, depending on the make and model of motorcycle.

Location of Exhaust Baffles

Exhaust baffles are generally placed just inside the silencer on the motorcycle's exhaust or at the rear of the exhaust pipe. Cycles that have an end cap installed require the removal of the cap for access to the baffle. It may also be necessary to remove components such as brackets or shields that restrict access to the part of the exhaust that needs to be worked on.

Removing the Baffles

Most baffles are held in place with self-tapping screws or small bolts and nuts that can be accessed on the top and bottom of the silencer or exhaust pipe. After removing the attachment hardware, a hook is used to grab the baffle and extract it from the rear of the exhaust pipe. It may be necessary to unwrap a cloth covering to inspect the baffle's condition. Baffles that are rusted through, collapsed, or show signs of deterioration should be replaced.

Installing Replacement Baffles

Use a baffle that meets the specifications of the original baffle and aligns with the existing screw or bolt holes. Wrap the baffle with wool or fibreglass cloth if the material is required to not exceed regulated noise levels. Two or three thin strips of masking tape can be used to hold the baffle cloth in place while the baffle is being slid back into the exhaust pipe. The masking tape burns off, so do not use a large amount of tape to secure the cloth. Slide the baffle back into the exhaust pipe. Some baffles have an end cap attached that need to be aligned properly to deflect exhaust gases in the proper direction. Use an awl smaller than the size of the attachment hole, usually about 0.7 cm in diameter, to align and centre the hole in the pipe with the hole in the baffle. Install the screw or nuts and bolts to hold the baffle in place.

Installing Baffles in a New Exhaust Pipe

Some custom motorcycle exhaust pipes come without baffles preinstalled. Measure the inside diameter of the exhaust pipe to determine what size baffle is needed to match the exhaust pipe. After selecting the type of baffle to install, the motorcycle owner should become familiar with the process. It is not difficult to install baffles in an exhaust pipe that was not fitted for baffles previously; some tools are required to accomplish the task. The following chart provides a quick reference to make sure the necessary tools are assembled to complete the job properly.

Installation Tool

Function of the Tool

Electric Drill

To drill attachment holes in the exhaust pipe to hold the baffle in place, a 90-degree or right-angle drill is recommended

Drill Bits

A one quarter-inch, or 0.7-cm, bit to drill the pipe and a three sixteenth-inch, or 0.5-cm, bit, if the baffle is not predrilled and a self tapping screw are used to secure the baffle


To attach the self-tapping screws, if used


To tighten attachment bolts and nuts, if used

Small Hook Tool

To help in positioning the baffle at the proper depth within the pipe


To help align the attachment holes on the baffle and exhaust pipe

Thin Masking Tape

To hold cloth baffle wraps, if used

Using an angle drill can prevent having to remove the exhaust pipe to position holes in the proper location. Many baffles have predrilled holes and attachment hardware included.

Drilling Attachment Holes

Place the baffle next to the exhaust pipe to identify and mark the position of attachment holes; an awl can be used to mark the pipe. Drill holes appropriate to the diameter of the attachment hardware in the exhaust pipe and, if necessary, in the baffle.

Inserting the Baffle Into the Exhaust Pipe

If using a cloth to reduce exhaust noise, wrap the baffle and use masking tape to hold the cloth in place. Push the baffle into the exhaust pipe until the depth that can allow the drilled holes to align is achieved. A hook tool can be used to position the baffle to the correct depth and hole location. Use an awl to centre the holes, install the attachment hardware, and tighten in place.

Buying Motorcycle Exhaust Baffles on eBay

Motorcycle owners can find baffles offered for sale on eBay by entering the keywords "motorcycle exhaust baffle" into any eBay search bar. A large selection of parts is listed at competitive prices from sellers eager to earn your business. Buyers can narrow search results by entering specific keywords, such as "Suzuki exhaust baffle", to display only the baffles that are designed for Suzuki motorcycles.

Whatever your choice of product, it is important to take the time to do research into the sellers whose products you are interested in purchasing. Buyers can review the seller's feedback ratings to gain confidence in the seller's manner of doing business based on the comments of previous buyers. If you have a question for the seller, you can use the information on the listing page to contact the seller directly. Buyers can feel secure in their transactions on eBay, thanks to the secure options they can utilise to pay for products on eBay.


While a roaring exhaust is sometimes considered a personal statement by motorcycle riders, making that statement loud enough to incur civil penalties is not an attractive prospect. Riding a motorcycle in remote regions without baffles may not involve risk of enforcement action; however, riding without baffles in congested business and residential areas is likely to draw the type of attention that most riders prefer to avoid.

Baffles perform an important function in the design, engineering, and tuning of stock motorcycles by helping bikes perform as the manufacturers intended. Motorcycle owners can perform the task of inspecting baffles to make sure they meet the standards they were designed for. In addition, when modifications are made to a motorcycle exhaust system, the bike owner can follow basic instructions to install exhaust baffles into new components should they not be so equipped. Motorcycle owners can stay on the right side of the law and keep their bikes performing as intended by making sure their vehicles have exhaust baffles installed and maintained.

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