Thats OK
Dont forget the bend at the outlet of the silencer , this makes a considerable contribution to the noise reduction.
Remember , that with a 70% or greater free area used in the preforated silencer core(large perforations) ,maintenance is greater due to errosion of the absorptive material caused by the high velocity exhaust gases , prior to blocking of the perforations due the oil entrained in the exhaust gases although the blocking of the larger perforations takes considerably longer or conversely you can use 70% or greater free area with smaller perforations which will block quicker with less absorptive material errosion. Either way it still requires maintenance.
The larger perforations showed approx. 0.5dba greater noise reduction at 3.0m, which barely perceptable to the normal human ear.
Regular cleaning and repacking will overcome the above issues keeping the bike relatively quiete
