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at an angle of 45° with the outlet in the horizontal plane (see IN.10.2.2 below) IN.10.2 Special Configurations
IN.10.2.1 Where more than one exhaust outlet is present, the test will be repeated for each exhaust
and the highest reading will be used.
IN.10.2.3 If the exhaust has any form of active tuning or throttling device or system, the exhaust must meet all requirements with the device or system in all positions.
IN.10.2.4 When the exhaust has a manually adjustable tuning device(s):
a. The position of the device must be visible to the officials for the noise test
b. The device must be manually operable by the officials during the noise test.
c. The device must not be moved or modified after the noise test is passed.