To install put the files in the correct folder and replace all motor lines with the following, putting in the engine variant you want obviously:
<motor template=”engineLarge” file=”sounds/cumminsISM_XXXXX_loop.gls” volumeScale=”2.2″ linkNodeOffset=”0 2 2.0″/>
<motor template=”indoorCabinRumble” />
<retarder file=”sounds/turbo_loop.gls” linkNode=”0>” innerRadius=”23.0″ outerRadius=”90.0″ pitchScale=”1″>>
<volume indoor=”0.15″ outdoor=”0.3″ >
</volume>
<loopSynthesisRpm>
<modifier type=”MOTOR_LOAD” value=”-0.00″ modifiedValue=”0.0″ />
<modifier type=”MOTOR_LOAD” value=”0.00″ modifiedValue=”0.0″ />
<modifier type=”MOTOR_LOAD” value=”0.25″ modifiedValue=”0.1″ />
<modifier type=”MOTOR_LOAD” value=”0.70″ modifiedValue=”0.25″ />
<modifier type=”MOTOR_LOAD” value=”1.00″ modifiedValue=”0.65″ />
<modifier type=”MOTOR_RPM_REAL” value=”500″ modifiedValue=”0.50″ />
<modifier type=”MOTOR_RPM_REAL” value=”1000″ modifiedValue=”1.0″ />
</loopSynthesisRpm>
<lowpassGain indoor=”0.7″ outdoor=”1″/>
</retarder>