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2. Transmission loss (duct acoustics) - Wikipedia

   en.wikipedia.org/wiki/Transmission_Loss_(duct...

   Transmission loss (TL) in duct acoustics describes the acoustic performances of a muffler-like system.It is frequently used in the industry areas such as muffler manufacturers and NVH (noise, vibration and harshness) department of automobile manufacturers, and in academic studies.

3. Whistle tip - Wikipedia

   en.wikipedia.org/wiki/Whistle_tip

   Whistle tips, also referred to as whistler tips, or whistlers, are modified vehicle exhaust pipes that generate a whistling sound during the operation of a motor vehicle that can often be heard up to a mile away. [1] The whistle tip is a small metal plate with a central hole that is welded into the inner tip of the exhaust pipe.

4. Tuned exhaust - Wikipedia

   en.wikipedia.org/wiki/Tuned_exhaust

   A 4-2-1 exhaust system is a type of exhaust manifold for an engine with four cylinders per bank, such as an inline-four engine or a V8 engine. The layout of a 4-2-1 system is as follows: four pipes (primary) come off the cylinder head , and merge into two pipes (secondary), which in turn finally link up to form one collector pipe.

5. Sound attenuator - Wikipedia

   en.wikipedia.org/wiki/Sound_attenuator

   A sound attenuator, or duct silencer, sound trap, or muffler, is a noise control acoustical treatment of Heating Ventilating and Air-Conditioning (HVAC) ductwork designed to reduce transmission of noise through the ductwork, either from equipment into occupied spaces in a building, or between occupied spaces.

6. How Trump's years of feuding with FBI Director Christopher ...

   www.aol.com/trumps-years-feuding-fbi-director...

   June 7, 2017: Trump nominates Wray. After firing FBI Director James Comey for his role in investigating Trump’s potential role in Russian interference in the 2016 election, then-President Trump ...

7. 6 Fast-Food Chains That Only Serve Freshly Cut Fries - AOL

   www.aol.com/6-fast-food-chains-only-170000557.html

   6. BurgerFi. As a relatively small and new chain, BurgerFi is getting a lot of praise for serving honest-to-Joe good burgers accompanied by equally good fries. The chain prides itself on using ...