get a small bore tube and stick it in your lug!! or use a doctors stethescope!!
I USE ONE WITH A PIECE OF BRAKE PIPE INSERTED INTO THE TUBE AND USE IT AS A PROBE-SUPRISING WHAT YOU CAN HEAR ESPECIALY AIR LEAKS-ALSO GOOD FOR TWIN 45/50'S FOR BALANCING AIR INTAKES
-OLD SKOOL STUFFS IS STILL THE BEST!!!!!!!!!!!!!!! GURU7001/2