making the Seawolf silent speed of 25 knots and doubling the Kilo endurance

[Castout]

I'm trying to make the Sewaolf much more realistic with having a virtually silent speed of 25 knots. Furthermore I'm trying to double the Kilo submerged endurance. thus making it more realistic.

I'm using the DWedit utility and playing with the object.eod file.

There is an object called thruster.

For the Kilo I think I just add 1 identical thruster but one which is NOT emitting any noise at all by tinkering with the speednoise parameter value of the object thruster class.

For the Seawolf I think I'm going to tinker with the speednoise value.

However I think the bigger the number of the speednoise parameter the quiter the sub becomes.

What does this speednoise mean? I mean the Seawolf has a speed noise level of 18 while the Kilo SSK has a speed noise of 11 and the Kilo improved has a speed noise of 13.
There is also the base noise which is always set at 0 I think.

Some help on the speednoise meaning is appreciated. Thanks