Nitro Boosts is an engineer-only permanent "enchant" to your belt. It will give a 5 second speed increase every 3 minutes. The actual speed increase is 150%, which is 50% more than epic land mount. It can only be applied to a belt in the engineer's inventory, and applying it will cause the belt to become soulbound. As of 4.0.1 this no longer takes a spot as an enchant, this means both an engineering enchant and a regular enchant (such as or ) can be present on one item, however will not stack with other engineer tinker enchants (such as the frag grenade tinker).