The cable is a programming cable for the factory.
For the GPS - remember you have to BIND the RX to your TX, THEN you can unplug the GPS.
Original question about a 2212 - too small of a motor.
Mod's?
Hmm... Mine has
1 - LemonRX 8 channel for 2x flaps and 2x ailerons
2 - "full wing" ailerons and half wing flaps
3 - EFlite BL15 motor and 40A ESC (4S) swinging an 11x6 prop
4 - LED's
5 - upgraded landing gear (from the Valient)
and enough dents and dings to make sure you know I fly it.