Just got mine today so shipping was pretty quick. They insert pretty easily and I can see how depending on how you put them in you can get different levels of sound protection. If the weather holds I will try it tomorrow and how it works on the motor.
2010 KTM 990 Adventure-Nuclear Fusion Powered
2000 KLR 650 My Son Adam's
He bought this bike with his own money as a "fixer upper" that he can ride and learn to wrench on. Part of owning is he will buy parts and wrench on it himself. We are going through it together and having fun! I am very proud of the young man he is becoming.