The Inductrix FPV + (or Inductrix FPV Plus) has been released in 2017 as the bigger brother of the Inductrix FPV.
The 8020 frame is significantly stronger than the stock frame.
The 40mm propellers sit much better on the motors than the stock props.
The CL-8020-14 give you similar performance to stock at a better price.
The 600mAh batteries yield better flight times than the stock batteries.
If you want to upgrade motors, props or frame to a larger size, you need to swap all three parts at once. The CL-0820-18 motors are only compatible to the 8520 frame and the 48mm props.