Sound of taxing aircraft engines very loud from within P51 cockpit

[v81]

Was doing some P51 training and heard a loud jet engine sound nearby and coming closer.

Problem is i couldn't sight the aircraft making the noise.

 

Ended up hitting F2 as the noise had become loud enough to block out the instructor voice over entirely.

 

After looking for the source i eventually spotted it on a taxiway 500m away and coming closer.

 

This was training mission 2, engine start.

 

Just something to keep a lookout for.

 

Cheers.