Porsche introduced two all-new engines and dropped the Tiptronic automatic in favor of its excellent PDK transmission. Starting with the standard Boxster, the engine has been upgraded from a 2.7-liter flat-six to a 2.9-liter unit putting out 255 hp and 214 lb-ft of torque. With the standard six-speed manual, Porsche conservatively quotes a 0-60 time of 5.6 seconds and a top speed of 163 mph. With the seven-speed PDK, acceleration times drop to 5.3 seconds (EPA fuel economy ratings are 20/29 with PDK). The range-topping Boxster S benefits from a new 3.4-liter direct-injection flat-six rated at 310 hp and 266 lb-ft of torque. Mated to the standard six-speed manual gearbox, it sprints to 60 mph in five seconds flat towards an unrestricted top speed of 170 mph. The dual-clutch PDK drops the acceleration time to just 4.7 seconds thanks to its “launch control” mode. As a benefit of direct injection, the EPA fuel economy ratings of the more powerful 3.4-liter mirror those of the standard model at 20/29 (the 2.9-liter engine does not have direct injection).