Measure your max diameter of your outlet hole. Try to measure the angle (If you have one) between the outlet flange and the body of the silencer...........then look online at
https://www.ebay.de/sch/i.html?_from...eater&_sacat=0 , there are loads of them to choose from and relatively cheap. If you do not have a mounting hole then drill one. They will quieten down your noise but will it be enough ............ no body knows unless you measure it. Now you can always try to use an App on your phone to measure the difference (Keep the same distance and revs of course).