Siren Builder

Kinkyu GoGo Gattai SairenBiruda
English Translation: Emergency Rumbling Fusion Siren Builder
Height: 50.0 m
Width: 39.0 m
Weight: 3500 t
Output Power: 400 km/h
BoukenSilver's robo. SirenBuilder has the ability to "Jack Up", which involves GoGo Fire's leg formation activating or deactivating at his command, which allows Siren Builder to dodge attacks. Also has Neo-Parallel Engine which is technically a Precious, so its energy was sucked out by Gajya by the finale causing a surge. Presumably, the three GouGouVehicles were later restored.
Gattai Name: Siren Formation
Attacks: Kunuckle Magnum (from Aider and Police) and the finisher Triple Liquid Bomber
GouGou Vehicle #11:
Gougou Fire
Height: 22.1 m
Width: 24.8 m
Length: 45.5 m
Weight: 3000t
Output power: 380 km/horsepower
Attack: Double Water Shoot
Cameo: Episode 19
Full Appearance: Episode 20
BoukenSilver came to the rescue, piloting this vehicle and the other two.
GouGou Vehicle #11:
Gougou Aider
Height: 8.0 m
Width: 8.0 m
Length: 20.4 m
Weight: 250 t
Output power: 350 km/horsepower
Cameo: Episode 19
Full Appearance: Episode 20
Can run without a pilot. Shoots lasers.
GouGou Vehicle #11:
Gougou Police
Height: 7.8m
Width: 8.6m
Length: 20.8m
Weight: 250t
Output power: 400 km/horsepower
Cameo: Episode 19
Full Appearance: Episode 20
Can run without a pilot. Shoots lasers.

BoukenSilver in the cockpit of the Gougou Fire. Remains the same for SirenBuilder.

SirenBuilder Drill Shovel
Created in Episode 22, the Go Go Drill and Shovel attached to the SirenBuilder. Its attack was the Double Arms Liquid Bomber.