In 1998, Holden Special Vehicles (HSV) of Australia contracted with Callaway to design, develop and build special high performance engines for their new HSV GTS sedan, built on the platform that would eventually support the 2004-2006 Pontiac GTO coupe.
The HSV Monaro GTS featured a total performance approach consistent with the Callaway-developed C4B engine. Using the Monaro engine, a version of the GM LS-series engine used in the Corvette, Callaway cylinder heads, camshaft, valvetrain, throttle body and specific engine management calibration increased power to 300 kW (400 hp) from the original 285 bhp while maintaining emissions compliance and passing GM durability testing. The added horsepower and improved handling placed the GTS in the same outright performance league as European rivals costing two to three times the price.
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