Things really get moving with the GTS 4.0, which instead employs a naturally aspirated 4.0-liter flat-six with 394 hp and — more importantly — a throatier exhaust note that more befits the Porsche badge. The standard Spyder uses a more potent version of this engine, tuned to 414 hp.
But the Spyder GT4 RS is another beast entirely. It boosts the flat-six's rev limit from 8,000 rpm to a stratospheric 9,000 rpm, along with a power increase to 493 hp. The GT4 RS also bumps torque from the PDK-equipped Spyder's 317 lb-ft to 331 lb-ft. The time attack theme is driven home by the fact that the Spyder GT4 RS is only available with the quick-shifting PDK dual-clutch automatic, which helps deliver a zero-to-60 mph time of just 3.2 seconds — 0.5 second quicker than the Spyder with the same transmission.
This extreme Spyder isn't just about straight-line speed, of course. It borrows liberally from the Cayman GT4 RS parts bin to make this convertible at home on a racetrack as well as a runway. The hood is made out of carbon fiber-reinforced plastic (CFRP) to shave weight — and contributes to an overall reduction of 59 pounds compared to the Spyder — vertical blades ahead of the front wheels to add downforce, and NACA ducts ahead of the front pillars to help cool the brakes. There's also an aggressively angled ducktail spoiler that replaces the Cayman's trick shelf spoiler and recalls the 911 Sport Classic, as well as vintage 911s.
Also from the Cayman is a standard Porsche Active Suspension Management system with a 30-mm drop and Porsche Torque Vectoring. The automaker says the suspension is tuned to deliver a more "relaxed" ride than the Cayman, but we still wouldn't put our grandmothers in this one.
If, however, you want to take the weight reduction and performance to its satisfying conclusion, you can spec the Weissach package. It includes lightweight forged magnesium wheels, titanium exhaust pipes, and a hood, air scoops and Gurney flap made of unpainted carbon fiber. A spool's worth of mass is added back in the form of "Weissach" embroidery on the seats, but hold the shaved carrot on your lunch salad and things will even out.