Yeah, thanks guys. The sound is awesome but I have been told by a few people that a silencer may not do the 8 or 9 decibels. In terms of the testing equipment, they use a microphone and a tripod and get u to rev. At idle, I was at 88dB and at 75% load (where they test it), it was 98dB. The testing method they show at this site is what they did: http://www.airpowersystems.com.au/us_spec/...swrx-hoe-r2.htm