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The Turbo-back (or turbo back) is part of the exhaust system from the outlet of a turbocharger to the final vent to open air. Turbo-back systems are generally produced as aftermarket performance systems for cars with turbochargers. Some turbo-back (and header-back) systems replace stock catalytic converters, while others have less flow restriction.
When the exhaust valve opens, the high pressure exhaust gas escapes into the exhaust manifold or header, creating an "exhaust pulse" comprising three main parts: The high-pressure head is created by the large pressure difference between the exhaust in the combustion chamber and the atmospheric pressure outside of the exhaust system
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.
The outgoing acoustic wave hits the narrowing convergent section and reflects back a strong series of acoustic pulses to the cylinder. They arrive in time to block the exhaust port, still open during the beginning of the compression stroke and push back into the cylinder any fresh mixture drawn out into the header of the expansion chamber.
These companies include: Weiand (intake manifolds and superchargers), B&M's supercharger division, Hooker Headers, Earl's Performance Plumbing, Flow Tech exhaust, Lunati (camshafts, crankshafts, pistons and connecting rods), NOS (Nitrous Oxide Systems, Inc), and So-Cal Speed Shop, as well as a few ancillary companies.
Conference foes No. 17 BYU and No. 23 Colorado will square off on Saturday night in the Alamo Bowl in San Antonio. The Cougars (10-2) and Buffaloes (9-3) once had their sights set on a Big 12 ...
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