Holden is ending assembly in Australia at the end of 2017, but General Motors' division Down Under is making sure that the brand's performance swan song has as many notes as possible. Holden Special Vehicles is reportedly developing a final Commodore using the 638-horsepower, supercharged LS9 V8 from the Corvette ZR1. If launched, the vehicle would be the most powerful performance car ever made in Australia, according to Drive. The model would also be a fitting follow-up to HSV's other recent, limited-edition models like the 577-hp Maloo GTS and 462-hp Senator HV.

Rumored to be called the GTS-R, HSV is keeping tight-lipped about the project and only admits that it wants to "go out with a bang," Drive reports. The ZR1's 6.2-liter supercharged V8 would certainly accomplish that, and the output comfortably tops the current Commodore GTS (pictured above) that puts out 577 hp from its LSA V8. Borrowing the 'Vette's carbon-ceramic brakes is a possibility, as well, to make sure the muscle car can haul down the powerful engine.

Opting for the latest LT-family of V8s isn't an option for the GTS-R because it reportedly doesn't fit in the engine bay, according to Drive. However, the LS9 isn't a perfect solution, either, because GM only keeps a limited stock of them. That means 200 or fewer of the farewell Commodores are likely to see Aussie roads. Combined with a price expected around 100,000 Australian dollars ($71,500 at current rates), they're almost guaranteed to be a seriously quick collector's item.


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