The RRP on all four (10.5, 13.5, 17.5 and 21.5) of the DUO 2 "Spec" motors is just £79.99 and with healthy bulk buy discounts that are avialable to all of our dealers you can expect to see many shops offering them to the public for less than that too. Each one is individually hand dyno tested too with the label on the box.
They are sensor based and will be joined by an all new modified version too very soon - called the "DUO 2 Platinum"

(DUO 2 PLATINUM - MODIFIED)
All DUO 2 motors (stock spec and modified) as well as LIPO batteries are on the way to the BRCA and EFRA for homologation and should be able to be used as soon as is possible.