That quote is a bit high… It should I would double check.
As for the tune if your doing the flash at home option I would get the cable at the same time. But I would wait for the clutch to be broken in before you try to flash the tune. It can be a bit different driving experience with the LWFW as it is let alone with the JHM tune that transforms the car.
The removal of the throttle lag alone makes it very difference.