"Engine Fusion! GunBir-O Tune up! Go-on!" Engine Combination GunBir-O (炎神合体ガンバルオー Enjin Gattai Ganbaruō), referred to as "Another King of Engines", is formed when Gunpherd, Birca and Carrigator combine. Its finishing attack is the GunBir Grand Prix (ガンバルグランプリ Ganbaru Guran Puri), where Carrigater first says "Herculean Strength Unrestricted" (剛力無制限 Gōriki Museigen), then GunBir-O performs a one-two slash attack with Gunpherd and Birca, then Carrigator participates by chomping onto the unfortunate Banki.