I dont have a boost controller or turbo engine la... just that when I removed the box I thought how well the space would fit a boost controller. :D
Boost controller many types ler, some has displays to be mounted on the dashboard/console with variable settings while some others are just like switches on a box with a few fixed settings only. The cheapest mechanical ones are mounted inside the engine bay la. :)
I think theres another way to keep the box closed... you can thicken the bumps at the side of the box which clicks with another bump on the dashboard to keep it in place. I dont know what is the proper term for the bumps.