"Off duty" Nissan engineers, in a secret meth lab at the Nissan Technical Centre Europe, raided the NISMO parts bin and came up with the 350 GT-S concept, a supercharged version of the production coupe. Nissan's boosted horsepower to around 374 hp (380 metric), and added a re-tuned suspension and Strosek aero package — all from aftermarket kit. The exhaust note was tuned by way of an electronically controlled bypass valve. The company calls it a "work in progress," but rumors have it the GT-S hearkens a special edition for production. It'll be unveiled the UK's Goodwood Festival of Speed next week.