Plane 
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Exhaust pipes turned up.  Most significant noise reduction because exhaust pulses aren't hammering the sides of the boat tail.
Exhaust pipes turned up. Most significant noise reduction because exhaust pulses aren't hammering the sides of the boat tail.
Viewed: 889 times.

Exhaust facing up an slightly rearward. This is the final configuration and is the most effective modification to reduce noise from the exhaust.
Exhaust facing up an slightly rearward. This is the final configuration and is the most effective modification to reduce noise from the exhaust.
Viewed: 893 times.

Viewed: 873 times.

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