Today at the Melbourne Auto Show in Australia, GM's Holden subsidiary is rumored to debut a new super sedan based on the Commodore and developed by its highly capable Holden Special Vehicles division. The exact nomenclature to be affixed to the sedan's flanks is unknown, but we expect a suitably sporty one like HSV GTSR, or something to that effect. It will powered by the 7.0L LS7 V8 from the Chevy Corvette Z06, which makes 505 hp in the Vette but will likely be detuned a smidge to just under 500 hp in the Holden, and could cost upwards of $150,000 in Aussie money. Reports suggest it will also have a cache of accompanying hardware to back up the monster motor like the largest brakes ever used on a Holden and lots of trickle down technology from Australia's V8 Supercar racing series. It will be built by hand away from the common Commodores, but still be covered by Holden's 3-year, 100,000 kilometer warranty. This will be fastest and most expensive (by far) vehicle that Holden has ever produced, and despite increasing concerns over the cost of gas in Oz, the brand believes it will have no trouble securing buyers for its limited allotment. We'll bring you more pics of the car after it debuts to what will surely be an astonished Australian market, but until then you can wrap your mind around the idea that what fits underneath the hood of this car should also fit in the engine bay of the Pontiac G8 and Chevy Camaro.