Talk:Research & Development/Fenyr Supersport/@comment-121.216.48.182-20160809210043/@comment-73.75.22.78-20160810200644

Upgrade all your choice from the start. Don't use the free upgrade until the speed is unlocked then use it for level 2 upgrade. For the next 3 free upgrades use them for level 3&4 speed and level 4 nitro.