As if 361 horsepower wasn't enough, the G8 will get an even hotter version with the intro of the GXP variant. The rear-drive G8's engine bay will be stuffed with a 6.2-liter V8 that generates 402 horsepower and 402 lb-ft of torque, and which will be mated to a standard-issue 6-speed automatic or an optional Tremec 6-speed manual. The car also gets a limited-slip differential to handle all that muscle.