Donated by a friend who took it off his K13S , about 1.5 hours to fit.
Noisier at the rider end , more of a howl under good acceleration , and feels much more grunty.
Here's a link to his original post when he fitted in 2019 , with some pics.
https://eurokclub.bike/index.php?topic=3519.msg42484#msg42484Got 2 large snorkels hanging around in the garage now , look like large she wee's !