Emergency Rumbling Fusion SirenBuilder is commanded by BoukenSilver, and is the combination of GoGo Fire, GoGo Aider, and GoGo Police, which is announced by the GoGo Changer as the Siren Formation. Its finishing attacks are Triple Liquid Bomber and Builder Crash.
SirenBuilder has the ability to "Jack Up", which involves GoGo Fire's leg formation activating or deactivating at his command; this comes in handy for dodging attacks or jumping ("Jack Down"). When it fires from Aider and Police, an attack called Knuckle Vulcans is activated.
SirenBuilder is part of the "SGS Rescue Project", which involves aid and defense of civilians and the use of Precious for humanity's sake, according to Morio Makino. SirenBuilder can also utilize GoGo Vehicles 4-10. In Task 42, Satoru released the limiters on SirenBuilder so he could detonate it along with the Quester's Homuculus, but was stopped by the other Boukengers.
Publication Information
- Device : GoGo Gattai SirenBuilder
- Japanese : 緊急轟轟合体サイレンビルダー
- Pilot : Boukengers
- Length : 21.5 m
- Width : 39 m
- Height : 50 m
- Weight : 3500 t
- Speed : 400 km/h
- Power : 12,000,000
- Combination :
- Type : Robot Support
- Usage : Combat
- Users : Boukengers
- Season : GoGo Sentai Boukenger
- First Appeareance : GoGo Sentai Boukenger Task 20 : The Brand-New Giant
- Last Appeareance : GoGo Sentai Boukenger Task 48 : The Endless Adventure Spirits
- Number of Appeareance :
GoGo Vehicles
GoGo Fire:
- Vehicles : GoGo Fire
- Pilot : Bouken Silver
- Length : 45.5 m
- Width : 24.8 m
- Height : 22.1 m
- Weight : 3000 tons
- Speed : 380 km/h
- Power : 10,000,000
GoGo Fire forms the head, torso, and legs of SirenBuilder. When the twin water cannons on its back are fired, it uses Double Water Shoot, an attack which BoukenSilver can use either in GoGo Fire or SirenBuilder. BoukenSilver receives his power from this vehicle's Neo Parallel Engine, making him the only Boukenger immune to the Gordom Engines that power the Questers (at least until the remodeling for the Parallel Engines of the other GoGo Vehicles was completed, allowing the other Boukengers to also become immune to the Gordom Engines).
GoGo Aider
- Vehicles : GoGo Aider
- Pilot : Bouken Silver
- Length : 20.4 m
- Width : 8 m
- Height : 8 m
- Weight : 250 tons
- Speed : 350 km/h
- Power : 1,000,000
BoukenSilver can control it and GoGo Police remotely via the GoGo Changer. It has the ability to fly and is armed with two blasters on the bumper (and more specifically, the areas which become SirenBuilder's left index and small fingers) which can fire bright red energy beams to attack. This vehicle can also deliver medical supplies to the Danger Zone and carries its own emergency room.
GoGo Police
- Vehicles : GoGo Police
- Pilot : Bouken Silver
- Length : 20.8 m
- Width : 8.6 m
- Height : 7.8 m
- Weight : 250 tons
- Speed : 400 km/h
- Power : 1,000,000
Additional Formations
SirenBuilder Drill & Shovel
- Device : SirenBuilder Drill & Shovel
- Japanese : サイレンビルダードリル&ショベル
- Pilot : Boukengers
- Length : 21.5 m
- Height : 50 m
- Weight : 3870 tons
- Speed : 400 km/h
- Combination :
SirenBuilder Drill & Mixer
- Device : SirenBuilder Drill & Shovel
- Japanese : サイレンビルダードリル&ミキサー
- Pilot : Boukengers
- Length : 21.5 m
- Height : 50 m
- Weight : 4270 tons
- Speed : 400 km/h
- Combination :
SirenBuilder Dozer & Marine
- Device : SirenBuilder Drill & Shovel
- Japanese : サイレンビルダードーザー&マリン
- Pilot : Boukengers
- Length : 21.5 m
- Height : 50 m
- Weight : 3260 tons
- Speed : 400 km/h
- Combination :
SirenBuilder Crane
- GoGo Gattai DaiBouken
- Boukenger Mecha
- GoGo Gattai DaiTanken
- GoGo Gattai SirenBuilder
- Super GoGo Gattai Super DaiBouken
- GoGo Gattai SirenBuilder