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2. Exhaust system - Wikipedia

   en.wikipedia.org/wiki/Exhaust_system

   The end of the final length of the exhaust pipe where it vents to open air, generally the only visible part of the exhaust system part on a vehicle, often ends with a straight or angled cut but may include a decorative tip. The tip is sometimes chromed. It frequently has a larger pipe than the rest of the exhaust system.

3. Expansion chamber - Wikipedia

   en.wikipedia.org/wiki/Expansion_chamber

   When the descending piston first exposes the exhaust port on the cylinder wall, the exhaust flows out powerfully due to its pressure (without assistance from the expansion chamber) so the diameter/area over the length of the first portion of the pipe is constant or near constant with a divergence of 0 to 2 degrees which preserves wave energy.

4. Tuned exhaust - Wikipedia

   en.wikipedia.org/wiki/Tuned_exhaust

   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. [2] Compared with a 4-1 exhaust system, a 4-2-1 often produces more power at mid-range engine speeds (RPM), while a 4-1 exhaust produces more power at high RPM.

5. Muffler - Wikipedia

   en.wikipedia.org/wiki/Muffler

   Silencer (silver) and exhaust pipe on a Ducati motorcycle A silencer cut open to show the insulation, chambers and piping inside the shell. A muffler (North American and Australian English) [1] or silencer (British English) is a device for reducing the noise emitted by the exhaust of an internal combustion engine—especially a noise-deadening device forming part of the exhaust system of an ...

6. Ariel Square Four - Wikipedia

   en.wikipedia.org/wiki/Ariel_Square_Four

   In 1953, the 'four pipe' 997 cc Ariel Square Four Mk II was released, with separate barrels, a re-designed cylinder head with four separate exhaust pipes from two cast-aluminium manifolds and a rocker-box combined with the inlet manifold. A redesigned frame provided clearance for the high-mounted, tall, car-type, SU carburettor.

7. Akrapovič - Wikipedia

   en.wikipedia.org/wiki/Akrapovič

   Akrapovič exhaust on a Koenigsegg Jesko. The company partners with motorcycle manufacturers such as Yamaha, [12] who offer Akrapovič cans as optional factory- or dealer-fit equipment on the R1, [13] and MT-01; [14] and BMW Motorrad who offer an Akrapovič can as standard on the R nineT, S1000R, F800R, [15] HP2 Megamoto, [16] and as an option on most other bikes in their range. [17]