IS-4 X
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- Speed / Mobility
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XIS-4
Assault Heavy Tank
This is a proposed field modification from skill4ltu for IS-4.
II
All-Terrain Suspension
Lightweight SuspensionIV
Parallax Adjustment
Aiming Gears LappingV
Sound Insulation
Periscope Electric DriveVII
Additional Noise Insulation 
Padding removalVIII
Auxiliary Safety System
Lightweight Mounting PointsChanges to technical characteristics
Effectiveness of maintaining speed when crossing all terrain types
-7%
Hull traverse speed
+5%
Suspension durability
+10%
Accuracy
+3%
Aiming time
+5%
Stun duration
+10%
Additional stun duration
+15%
View range
+3%
HE-shell and ramming damage
-15%
Stun duration
-8%
Protection of the crew from injuries
+20%
Top forward speed
-2 km/h
Hull traverse speed
-5%
Durability of internal modules
+30%
Repair speed
+5%
Turret traverse speed
-5%
Dispersion during turret traverse
+5%
Vehicle hit points (bonus of Standard Modifications)
+5%