Ducati Sporting Club UK > DesmoDue Race Series > DesmoDue - General Questions and Chat > Don't rock the boat babeeee!

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From the CC website

The noise limit for the day is 105 db(A), which is measured at ½ metre from the exhaust outlet at ¾ maximum revs. It is the rider’s responsibility to ensure that their machine is within this limit. All machines are sound tested prior to going out on the circuit. In the event of a machine failing the sound check, then the rider will be entitled to a 75% refund. If you are unsure if your bike will get through the noise test (i.e. if it is fitted with an after market exhaust system), then you can always come over to get the bike noise tested prior to booking a place.

ACU Noise tests for our bikes are at 5500rpm so about 3/5 maximum revs for a Class A bike and this measurement is taken 0.5 meters away at a angle of 45 degrees, there is no mention of any angle on the CC website and with the higher revs used the readings will come out higher than those that were taken at Snetterton

In the past I have found most race cans need to be well baffled at Castle Combe and have needed to be since we first took CBR600s there over 10 years ago. In the past we have never had a problem getting a quiet race bike out on a Castle Combe trackday.