Turbo

Info
This upgrade grants a significant speed increase for a short amount of time each time you kill an enemy.

Like Afterburner, the exact speed increase is unspecified.

Multiple instances of this upgrade trigger at the same time and independently, stacking the increase to movement speed but not the duration of the increase.

Rare
4-second speed boost

Epic
6-second speed boost

Strategy
This upgrade is fairly narrow in its application. Equip a Turbo to tanks that want to engage in hit-and-run tactics so you have the speed to get out of harm's way after an attack, or on tanks that want to charge forward no matter what.

Turbo is an upgrade that is not often useful, but will usually catch your opponents by surprise when it does work, given the rare nature of the upgrade itself and the conditional bonus it grants.