Hi this is not in a HL 1/16 tank but i put a 1 watt amp in my 1/24 FOV tank it sounds much better now .. Before you could not here the sound when running now you can clearly here the clanking and high pitch sounds that where hardly noticable at all.
Take a listen here:
http://www.youtube.com/watch?v=b5MUQsfU1Zg