OK unifilter have now finished there final product, I have one in my bike now and am very happy with it. Here is the final design. Here you can see both filters the inner has the spring and the trumpet from the TB fitted on the left and you can see the right side with the spring ready to be fitted. Once you have both Trumpets in the inner filter just tighten the reusable cable ties up so the filter is snug. Place the front Trumpet on and lock in to place and repeat with the rear Trumpet. Now fit the orange outer filter over the inner and lock the velcro strap. Everything else is the same as my first post in K&N filter thread. These filters are now in production.