20.3cm (No.3) Twin Gun Mount/Bonuses

Ship Extra Requirement Firepower Torpedo Attack Anti-Air Anti-Submarine Warfare Line of Sight Armor Evasion Note
Mogami Kai Ni (Toku)Mogami Kai Ni +3 +1 Additional guns beyond the 1st will provide an additional +2/+1 Firepower (2nd/3rd+ Gun) on top of the base fit bonus.
+ LOS Radar +4 +2 +3
+ Type 21 Air RadarType 21 Air Radar +1 +3 +2 Non-stackable with Type 21 Air Radar Kai NiType 21 Air Radar Kai Ni's bonus below
+ Type 21 Air Radar Kai NiType 21 Air Radar Kai Ni +3 +3 +2 Stacks with LOS Radar bonus
Mogami-classMogami
Mikuma
Suzuya
Kumano

Tone-classTone
Chikuma
+2 +1 Additional guns beyond the 1st will provide an additional +2/+1 Firepower (2nd/3rd+ Gun) on top of the base fit bonus.
+ LOS Radar +3 +2 +2
Myoukou-classMyoukou
Haguro
Ashigara
Nachi

Takao-classTakao
Atago
Maya
Choukai
+2 +1
+ LOS Radar +3 +2 +2
Furutaka-classFurutaka
Kako

Aoba-classAoba
Kinugasa
+1
+ LOS Radar +1 +1 +1 Non-stackable with LOS Radar bonus from 20.3cm (No.2) Twin Gun Mount