Volvo FH16 Open pipe sound v1.2

Feature:

-Volvo FH16 open pipe sound for Volvo D16G/D16K engines

-Gear change and retarder sound

-Jake brake engage sound when upshift (activate at 1000-1600rpm range)

-Realistic turbo behavior

-Custom sound attenuation for realistic sound fade off

-Custom sound orientation for realistic sound from different angle

-Custom sound distortion for realistic exhaust tone depends on how much throttle pressed