Exhaust Systems

An exhaust manifold or header collects the exhaust gases from multiple cylinders into one pipe. The word manifold may come from the Old English advice manigfeald (from the Anglo-Saxon manig [many] and feald [fold]) and refers to the folding together of multiple inputs and outputs.

Variable Length Intake Manifold (VLIM) is an intimate combustion engine manifold technology
Four common implementations exist
First, two discrete intake runners with distant length are employed, and a butterfly valve can close the short path
Second the intake runners can be bent around a average plenum, and a sliding valve separates them from the plenum with a Exhaust Systems variable length
Straight high-speed runners can receive plugs, which contain dwarf distant runner extensions.