Modifications

Modifications are upgrades that can be unlocked and purchased either by earning research points with a vehicle and then purchasing it with silver lions , or by paying golden eagles to research and purchase the modification instantly. All of the modifications vary on the increase (or decrease) of the statistical and literal performance.

When all modifications in a tier are unlocked, an amount of vehicle research points is awarded. The award corresponds to 20% of the total RP cost for that tier. For example, if there are 4 modifications of 1,500 RP each, the award is 0.2 x 6,000 = 1,200 RP. While this award is minimal for low-rank vehicles (a few hundred RP), it can become consequential with top-tier vehicles (several thousands of RP). This award is received when each tier is completed (4 tiers in total). Furthermore, the award is not impacted by research efficiency and other multipliers.

Air Forces

There are three different categories of modifications for aircraft: Flight performance, Survivability, and Weaponry.

Planes

Flight Performance

These modifications improve the flight characteristics of the aircraft, with varying degrees of success. They will generally increase maximum speed and rate of climb, as well as decreasing the turn time of the aircraft.

	Fuselage repair	Decreases the drag coefficient.
	Radiator	Improves the cooling system in the engine.
	Compressor	Increases overall engine performance by increasing its horsepower/thrust.
	Wings repair	Reduces drag, and increases lift efficiency coefficient.
	Engine	Adds horsepower/thrust.
	Engine injection	Increases efficiency of the engine throttle.
	G-Suit	Allows the crew to experience greater G-force overload before "blacking out".
	New boosters	Increases flight control assistance, allowing full input at higher speeds, resulting in less locking-up of the ailerons, elevators, and/or rudders. This modification is mainly found on jet aircraft.
	X octane fuel	Allows the engine to run at higher settings to increase power output.

Survivability

These modifications strengthen the aircraft, allowing the aircraft to potentially survive for longer. They may also improve the flight characteristics of the aircraft, through weight and drag reduction.

	Airframe	Adds 10% construction strength, reduces weight.
	Cover	Adds 5% construction strength, reduces weight.
	Protective vest	Partially protects crew members from shells and flak fragmentation, typically found on heavy bombers.
	Armored glass	Increases the thickness of the armoured windscreen.
	Rear armor plate	Adds armour to protect the pilot, typically found on USSR aircraft.
	Engine Fire System	Allows you to put out fire engines automatically.

Weaponry

These modifications allow to customize your weaponry of your aircraft. This also includes unlocking of new suspended ordnance or different configurations of the aircraft's offensive armament.

	Offensive X mm	Unlocks a choice of ammunition belts for the particular gun calibre.
	New X mm MGs/cannons	Replaces the old MG/cannon with new parts, or a whole new gun. This decreases the bullet spread and failure rate (chance of overheating/jamming) of the gun.
	Turret X mm	Unlocks a choice of ammunition belts for defensive turrets of the particular gun calibre.
	New X mm MGs/cannons (turret)	Similar to "New X mm MGs/cannons", but only applies to turret-mounted armament.
	Cannons Machine guns Gunpods	Allows you to install different or additional cannons, either within the airframe or externally (gunpods).
	Bombs	Allows you to equip different or additional suspended armament.
	Missiles
	Rockets
	Torpedoes Mines
	Flares/Chaff	Allows you to equip countermeasures.
	NVD	Allows use of night vision devices and thermal optics

Helicopters

Helicopters share a lot of the same modifications as aircraft, but there are some unique examples.

Flight Performance

	Replacing helicopter blades	Improves the efficiency and capabilities of the helicopter blades, increasing max speed.

Survivability

	Flak jacket	Similar to the "Protective vest" aircraft modification.
	Helicopter frame	Similar to the "Airframe" modification.

Weaponry

	IRCM	Installs an IR lamp that can confuse the sensors of an incoming IR missile.
	HIRSS	Reduces the engines' IR signature.

Ground Forces

Modifications for ground vehicles are split into three categories: Mobility, Protection, and Firepower. Depending on the total number of modifications of the selected vehicle, some modifications can be found in a different category.

Mobility

Modifications that improve your tank's ability to manoeuvre around the terrain.

	Tracks/Tires	Increases track durability and traction.
	Suspension	Increases suspension tolerance to rough ground, increasing mobility.
	Brake System	Allows faster braking speed and force.
	Filters	Increases engine horsepower and acceleration.
	Transmission	Increases horsepower to the drive wheels, increasing acceleration.
	Engine	Increases engine horsepower and acceleration.

Protection

Modifications increasing the survivability of the tank. These are the most important modifications to upgrade.

	Parts	Allows the tank to be repaired in the field. Important if you need to fix a module that has crippled your tank such as the transmission or engine.
	FPE	Fire Protection Equipment, allows the tank to extinguish a fire.
	Crew Replenishment	Allows you to replenish your crew while in combat.
	Add-on Armor	Attaches improvised armour onto the vehicle to increase armour thickness. Increases survivability.
	Dozer Blade	Equips the vehicle with a bulldozer blade to dig defensive positions.
	Smoke grenade	When launched, creates a smoke screen around the grenade's point of landing.
	ESS	Engine Smoke-generating System, when activated will continuously generate a smoke screen originating from the engine for a period of time.
	NVD	Allows use of night vision devices and thermal optics (this module is sometimes located in the Firepower section).

Firepower

Modifications improving various aspects of the tank's weaponry systems.

	Horizontal Drive	Increases turret traverse speed.
	Adjustment of Fire	Increases gun accuracy by decreasing horizontal and vertical spread.
	Elevation Mechanism	Increases turret vertical traverse speed and decreases vertical spread in gun accuracy.
	Artillery Support	Calls for indirect artillery fire on a position. Not available for heavy tanks or tank destroyers.
	Ammunition	Unlocks different ammo for usage in the tank's armaments.
	Airstrike	Allows you to join an air battle activated by an ally on a bomber or attacker in Arcade, or reduces the cost in spawn points to spawn an aircraft for each scouted enemy that is destroyed by an ally in Realistic battles. This modification is only available on certain light tanks with the "scouting" ability.
	Improved optics	Increases the detection radius of enemy vehicles by +30% of the crew's visual range.
	(Laser) Rangefinder	Improves accuracy and speed of the gunner's rangefinding abilities.
	Scout UAV	Allows you to carry and launch a scout UAV.

Naval Forces

Modifications for naval vessels are split into the Seakeeping, Unsinkability, and Firepower categories.

Seakeeping

These modifications improve the mobility and manoeuvrability of the ship.

	Dry-Docking	Cleans the hull of the ship, reducing drag.
	Rudder Replacement	Improves the rudder and steering mechanisms, decreasing turn time and radius.
	Propeller Replacement	Improves the propellers, increasing max speed and acceleration.
	Engine Maintenance	Improves the engines and related systems, increasing max forward and reverse speed, as well as acceleration.

Unsinkability

These modifications increase the survivability of the ship, as well as providing other protective mechanisms.

	Tool Set	Allows repair of the ship while at sea.
	Fire Protection System	Allows fires to be put out without having to submerge the ship.
	Smokescreen	Generates a smoke screen behind the ship continuously for a period of time.
	Shrapnel Protection	Reduces the effect of shrapnel inside the ship.
	Ventilation	Reduces crew casualties from smoke in the case of a fire.
	New Pumps	Increases the speed at which water is pumped out of the ship after the breach is repaired.
	Ammo Wetting	Reduces chance of ammo detonation due to fires.

Firepower

These modifications focus on improving the weaponry of the ship, including the available ammo belts and shells to be used, as well as new equipment such as bomb mortars and depth charges.

	Primary/Auxiliary/Anti-air Armament Targeting	Increase the turret rotation and pitch speed of the respective armament groups.
	Artillery Support	Calls for bombardment from an off-map warship's main calibre guns on a designated position.
	Improved Rangefinder	Increases the accuracy and speed of rangefinding.
	Torpedo Mode	Increases the range of a torpedo in exchange for reducing its speed (or vice versa).
	Ammunition	Unlocks different ammo for usage in the ship's armaments.
	Depth charges Mines Rocket Launcher Mortar	Allows you to equip additional weaponry.
	Hydroplane	Ship-launched scout plane carried by some cruisers and battleships, useful for tactical operations.