I was concerned about my stock IT250J passing the new noise level limit of 94dB for recreg. My suspisions were confirmed when I purchased a noise level meter. My test was done on a static bike in a closed 155 square metre factory of concrete slab construction. Bike was propped upright on the ground. Readings were taken at waist level from a distance of 2m (6ft). Four readings were taken for each subsequent modification, from 1. chamber side, 2. the rear, 3. clutch side, 4. front. All figures were rounded up to the next full dB figure. Stock: 1. 101dB 2. 94dB 3. 100dB 4. 92dB Addition of fibreglass header gasket: 1. 96dB 2. 92dB 3. 94dB 4. 90dB Addition of two extra barrel fin dampeners and one extra head fin dampener: 1. 94dB 2. 91dB 3. 92dB 4. 90dB Addition of fibreglass heat wrap: 1. 90dB 2. 89dB 3. 90dB 4. 88dB Hope this is of benefit to your neighbours, local authorities and your ears. Cheers, Chrisko.