JAK WYCISZYŁEM KASK HJC i91

Even before buying a helmet, which I didn't have a specific model in mind, I knew I'd want it to be quieter than the factory default. I decided to do so, and see for yourself what I used to quiet it down, because it was a lot of fun when I came up with the idea :) My motorcycle is a Yamaha BT 1100 BULLDOG.