Sunday, October 20, 2013
Tips for Loud Exhausts
Your vehicles exhaust noise is determine by the engine size, engine type, exhaust piping, muffler and muffler location. The engines combustion gases are ported out the exhaust manifold through pipes into the catalytic converter (if installed), then through the muffler and finally escaping through the tailpipe. The largest contributor to your exhausts sound profile is the muffler. Mufflers that dampen the sound may have multiple chambers and baffles that reflect and absorb sound waves. Mufflers with straight-through designs allow much of the exhaust sound to pass through to the tailpipe.
Sound-Dampening the Cabin
Muffler sound, which is felt and heard in the cabin, can be controlled by installing sound-dampening material. Mats of sound-dampening material should be placed under the carpet, against metal surfaces and in the walls of the doors to reduce vibration.
Muffler Change
Exchanging a muffler for a different style will allow you to alter the exhaust sound profile. For increased sound and resonance, glass packs, straight pipes and mufflers without chambers should be installed. For reduced sound, consider mufflers with sound-dampening baffles and chambers. Increases in pipe size (which will increase the volume of noise) can also be considered when changing the muffler system. Pipe sizes different from stock size should be investigated to determine the effect on engine performance.
Exhaust Tips
Tips that are lined with fiberglass or sound-dampening layers of material are referred to as "resonated tips." Resonated exhaust tips are installed on the tailpipe and reduce the amount of noise the exhaust system produces at the tip.
Tip shapes and styles (such as flared, beveled, dual-walled, and diameter-changing tips) may also affect the loudness of the exhaust and the tone.
Sound-Dampening Exhaust Wrap
To dampen the vibration and resulting escape of sound waves from the exhaust system, consider installing high-temperature exhaust wrap on the exhaust pipes and muffler. The wrap may also be insulating, reducing the overall temperature transferred to the vehicle. Use caution when installing exhaust wrap as moisture collection may result in accelerated decay of the underlying metals.
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