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We couldn't help but listen to the comments of other onlookers as we closely inspected the G8 GXP Street Concept in the G8 booth. Every reaction was overwhelmingly positive, from the overall design to the motor. After all, what's not to like? For starters, the standard 6.2L V8 has been replaced with an LSX454 crate motor that uses the LSX Bowtie block, six-bolt LSX cylinder heads and a forged rotating assembly. In total, the 7.4L V8 pushes out a massive 638 horsepower and 600 lb-ft torque that's directed through a 6-speed automatic transmission. The exterior gets a makeover with new front and rear fascias, rocker panels, custom upper and lower grilles and black chrome trim. Inside, the G8 GXP Street Concept also gets custom leather trimmed seats, a new gauge cluster and more black chrome. Yeah, it's basically a four-door ZR1.