Saw this recently - http://duttongarage.com/Holden-Monaro~1712

One of only 2 Holden Monaro HRT 427's ever made sold by duttons recently.

Wondered if anyone knew how much it went for/might have gone for?

pretty sure this is the million dollar holden from a couple years back

From wikipedia...

"2002 HRT 427
Displayed at the 2002 Sydney Motor Show, the HRT 427 based on a modified Monaro bodyshell. The MacPherson strut front suspension was replaced by an aluminium double A-arm setup with adjustable dampers and a weight reduction program - including a carbon fibre bonnet and magnesium wheels - brought the car's weight down to just 1575 kg (3472 lb).[33] The name was derived from the engine used,[34] a 427 cubic inches (7,000 cm3) (7.0-Litre) V8 engine from the Corvette C5-R (based on the GM LS7 design), producing 417.6 kW (560 bhp) @ 6000 rpm. This powerplant was built by Melbourne-based John Sidney Racing, renowned for its success in the Australian Sprintcar and NASCAR series. The transmission used was a custom Tremec T56 M12 six-speed manual gearbox with a heavy-duty 900 N�m clutch, endowning the car with a 0 to 100 km/h (62 mph) spring in 4.4 second and a top speed of 299 km/h (186 mph). Other unique fittings included: AP Racing six-piston racing brakes; ram air induction; Motec instrument panel; two Sparco Pro 2000 seats; half roll cage.[33][35]

Originally intended to be put into production as competition against vehicles such as the Porsche 911 GT2, it soon became apparent to Holden that the high specification HRT 427 could not be built in such limited quantities for the original A$215,000 asking price.[36] As a result, the project was eventually cancelled and all customer deposits received refunded.

The only HRT 427's in existence are two road cars and four racing versions (the latter built by Garry Rogers Motorsport for use in the short-lived Bathurst 24 Hour race and Australian Nations Cup Championship), each of which cost about A$500,000 to build. The road cars had a reported 420 kW (571 PS; 563 hp) of power and 780 N�m (580 lb�ft) of torque. One of these is not for sale and has remained within Holden's concept car collection. In April 2008, the other road car was sold to the Cairns car collector, Shawn Ryan. It has since been inaccurately stated in the media that he paid the record-breaking price of A$920,000, making it the most expensive Australian car ever sold. In reality, however, the quoted price tag was for both an HRT 427 and the first HSV VS GTS-R ever built. The portion of that figure attributable to the HRT 427 is estimated at $790,000.[37] In June 2010, the concept car was re-sold at auction in Sydney to an anonymous Queensland buyer at the far lower price of A$350,000.[38] The four racing cars have likewise made their way into collections, with their racing careers shortened by regulation changes.

The interest in the HRT 427 was such that, in 2008, its spiritual production version became the HSV W427 sedan built to celebrate HSV's 20th anniversary. In addition, in 2004, a more affordable racing coup� version reemerged in the form of the HSV GTS-R."

I remember hearing that the 427 coupe displayed at the Sydney motor show was the CV6 used at the Monaro launch and in brochures as well.