Behold the Mumbo: Holden EFIJY ConceptJonny Lieberman5/12/07 3:00pmFiled to: Pretty Picture WeekendefijyAustraliaConcept CarsEl CaminoFjHolden16EditPromoteShare to KinjaToggle Conversation toolsGo to permalinkFirst introduced in 2005, the Holden EFIJY has managed to fly under the Jalopnik radar — until now. Er, actually, until last night when we brought you some photos of it parked next to Chevy's Camaro Convertible Concept at Bob's Big Boy in Burbank. Well, in truth, the Postfather reported on the EFIJY back in October of 2005. A fact which only Davey would remember. Still, cars this bonkers deserve more virtual ink. At Bob's, friendly GM PR person Julie managed to track down a flash drive loaded with all sorts of, well, GM PR stuff, including these shots of the EFIJY. The press release claims that the EFIJY, "delivers retro, mumbo and gizmos in one glorious package." Which is just one more reason why we love Australia so damn much. Their cars have mumbo. Just to reiterate, the EFIJY rides on a stretched Corvette Chassis, packs a 645 hp supercharged LS2 and has the very, very coolest speedometer of all time. Click through the gallery to check out not only the 1953 Holden FJ that the EFIJY is an homage to, but an amazing Camino variant. Mumbo indeed. Full historical document press release after the jump.