When the FBMW transitions into the high rpm sound, an annoying (to me)
tapping sound occurs. This zip contains the original and a replacement
file which elminates most of the tapping by  removing a bit less than
1/2 second from the beginning of the original sound.

The zip contiains these two files:

GameData\Sounds\FBMWEngine\rF1V8_onhigh.wav
GameData\Sounds\FBMWEngine\rF1V8_onhigh.org

http://jeffareid.net/rfr/fbmwfix.zip