Best of the Best 2013: Speciality Vehicles: Extreme-Performance Car: AMS Alpha 12 GT-R

Not content with your 2013 Nissan GT-R’s factory 545 hp rating? Not to worry. AMS Performance, a 12-year-old tuning company in West Chicago, Ill., offers the Alpha 12 enhancement package. For $99,000 (plus the approximately $100,000 price of a stock GT-R), AMS increases the engine’s displacement from 3.8 liters to 4 and upgrades the car’s intake, engine-management, and exhaust systems so that the vehicle produces 1,100 hp on pump gas and 1,500 hp on racing fuel. When running on the latter, the Alpha 12 blasts from zero to 60 mph in 2.4 seconds and then on to 130 mph in about 3.5 seconds more.

The Alpha 12 retains Nissan’s standard all-wheel drive and sequential 6-speed manual paddleshift gearbox, and, like the stock GT-R, it displays impressive street manners. The Alpha 12 also looks like a stock GT-R, not an overwinged, spoilered-up tuner toy.

AMS Performance, 847.709.0530, www.amsperformance.com