Hennessey

The Nissan GT-R V Spec will allegedly be packing 520 horses when it arrives some time next year. That still won't be enough for a lot of people (especially folks who want to win seriously competitive drag races), so Hennessey is offering GT-R upgrades that beef Godzilla up to 600 hp. The seven mods in the kit don't do anything crazy to the car -- items like stainless steel turbo downpipes and a wastegate actuator upgrade -- they simply combine to add 120 hp to the corral already on hand. As far as we're concerned, we'd take that over a 520 hp V Spec any day... we can rip out the rear seats ourselves.

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Click above to view Hennessey's Viper ACR upon delivery

From the Mustang to the Viper and Veyron, Hennessey Performance has spread its abilities across the performance car spectrum. And with hi-po vehicles like the IS F, ZR1, and GT-R on their way to buyers' garages, John Hennessey says he is working on packages to make all of those cars even higher-po.

Click above for high-res gallery of the 2008 Dodge Challenger SRT8