Walker Support

Make sure application matches catalogue listing-- year, make, model, engine, wheel base and 2 or 4x4 for trucks -- and that all pertinent footnotes have been considered. Walker parts are not guaranteed to fit with other after market companies exhaust products.

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A number of reasons can be linked to a loud exhaust system:

1. Has the converter been removed from the system? This will make the system louder as the converter will act as a sound absorbing devise.
2. Has a performance or "economy" part been incorporated into the system?
3. If possible, place your hand on the tail pipe and try to move the system from side to side, then up and down, to determine if the system is hung securely and not grounding or touching the under-body of the vehicle.
4. If the noise is a popping sound at the tail pipe end, check under the hood and determine if the engine is equipped with an A.I.R. pump. If an A.I.R. is present, disconnect the belt from the pump. If the noise ceases, the valve in the pump is faulty and should be replaced. If the vehicle is not equipped with an A.I.R. pump, the problem could be in the engine. A compression test should be made.
5. Should further investigation be required, place the vehicle on a lift, raise the vehicle, and inspect the exhaust installation. Check for the following:
   • Grounding
   • Broken hangers and insulators
   • Loose/leaking joints
   • Muffler and resonator installed backwards
   • Missing converter
   • Resonator substitute pipe in use
   • Worn out heat riser
   • Engine with faulty timing
   • Use of "economy" or performance muffler
   All of these conditions can lead to complaints concerning excessive exhaust system noise.

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Walker Quiet Flow mufflers are designed as a direct fit component and are not recommended for reversed installation.

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Insulators should be inspected and replaced if they show signs of being brittle (dried out) or stretched.

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This is a weep hole and is designed to allow excess moisture to escape from the muffler. This will not be found in all mufflers and will be used only where needed.

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A Walker Quiet Flow muffler is a 3 tubed design, premium muffler that is designed for O.E. equivalent sound and precision fit.

A Sound FX muffler is a 2 tube design muffler, with direct fit designs that are O.E. equivalent.

A Pro Fit muffler is a high quality universal fit muffler for installer shops and fabrication uses.

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Mandrel or smooth bend pipes are designed pipes are for the optimal flow and are typically found in performance exhaust. A serrated bent pipe will have small creases in the bends and is typically found in O.E. pipes.

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What are we trying to get rid of?

Gasoline engines are fueled with two chemical compounds: gasoline and air. Basically, gasoline is made of two elements: Hydrogen (H2) and carbon (C). In the form of gasoline, these two chemicals combine to make what we call a hydrocarbon (HC). Air is made up of basically two elements: oxygen (02) and nitrogen (N2).

If gasoline engines burned their fuel as efficiently as possible, they would produce three by-products: water vapor (H20), carbon dioxide (C02), nitrogen (N2).

For the most part, none of these chemical compounds are harmful; however, environmentalists argue that excessive amounts of carbon dioxide promotes formation of the greenhouse effect. Nonetheless, H20, C02, and N2 are the most desirable by-products of combustion, and automotive engineers strive to create emission control systems that allow a vehicle to produce only these three chemical groups.

Unfortunately, engines don't run perfectly, and as a result they also produce three by-products commonly referred to as the "terrible trio" of automotive pollutants. This trio includes the following: carbon monoxide (C0), unburned hydrocarbons (HC), oxides of nitrogen (NOx).

Carbon monoxide (CO) is an odorless, tasteless, poisonous gas that can cause a variety of health problems, and even death. Many urban areas experience critically high levels of carbon monoxide, especially during the cold winter months when engines take longer to warm up and run cleanly.

Unburned hydrocarbons (HC) cause a variety of respiratory problems, crop damage, and promotes the formation of smog.

Like unburned hydrocarbons, oxides of nitrogen (NOx) cause respiratory problems, and promote the formation of smog.

This is what we want:

• Water vapor (H20)
• Carbon dioxide (C02)
• Nitrogen (N2)

This is what we don't want:

• Carbon monoxide (C0)
• Unburned hydrocarbons (HC)
• Oxides of nitrogen (NOx)

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A three-way converter is designed to lower all 3 elements, CO, HC, and NOx. A two-way converter was designed to lower CO and HC only.

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Generally, there are only 3 situations when you can install an aftermarket converter. They are:

1. If the converter is missing from the vehicle when brought in for exhaust system repair; or
2. If a State or local inspection program has determined the existing converter has been lead poisoned, damaged, or otherwise needs replacement; or
3. If the vehicle is more than 5 years old or has more than 50,000 miles and a legitimate need for replacement has been established and appropriately documented (e.g., a plugged converter or un-repairable exhaust leaks).

Any other converter replacement must be with a "certified" or new original equipment (OE) or equivalent converter.

After market converters cannot be used for replacement if:

• the existing converter is present and functioning properly; or
• the replacement is under recall or warranty.

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Removal of a converter is prohibited by law unless used for off-road race use only.

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