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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.
In July 2012, Qatar requested the sale of 24 AH-64Es with associated equipment and support. [306] The sale was approved on 27 March 2014. [307] In March 2019, Qatar received the first of 24 AH-64Es ordered. [308] In July 2016, the UK placed an order for 50 AH-64Es through the U.S. FMS program instead of upgrading their Westland-built WAH-64s. [309]