Perhaps the best thing about the Hennessey VR1200 pack on the Cadillac CTS-V is that it can be had on the wagon, and it looks pretty unassuming. Sure isn't subtle when it's screaming and putting more than 1,000 rear wheel hp.
In V700 spec, it was already a formidable machine. This dyno video shows the VR1200 is crazy. You're going to want to tie down your groceries tightly in this.