With the "build it yourself kit" you can have choice of suspension stiffness and coils. American made coils and spiders will also be available. The standard sub will have an 8 layer FW Aluminum wire coil. You can also order the kit with 4 layer copper coils. For the time being only dual one and two ohm coils will be offered but that is subject to change depending on demand.
The sub comes with upgraded cooling and beveled pole piece. No upgrades are required.
As soon as shipping info comes from the factory I will post a release date.