I am going to buy a back box for the K11 at some point next week and I was just wondering if you guys had any to recommend. At the moment it looks like I will be buying the Sportex rear silencer from the POTN website. I would ideally like to install a whole new system but unfortunately uni is looming and I need all the pennies I can get - but the peashooter has to go. I have also looked at the Janspeed box but it is about £40 more expensive. Any thoughts?