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The C5-R initially used a 366 ci (6.0 liter) V8 engine based on the road car's LS1.
Along with Holden's V8 Commodore-based AWD vehicles, the HSV Avalanche series was discontinued in late 2005 due to phasing out of the 5.7 litre LS1 engines because of the Euro III emissions regulations.
While the GT car is powered by the Jaguar V12 engine, the prototype was originally intended to be fitted with a Judd V10 powerplant but was built with a Chevrolet V8.
The genesis for MAFless tuning of the LS1 in Australia was the HSV GTS version of the Holden Commodore, which was factory fitted with a Callaway-developed C4B version of that engine running in MAFless mode.