GM Performance is now offering a dealer-installed performance option for the 2.0-liter, direct-injection turbo four-cylinder found in the Pontiac Solstice GXP, the Saturn Sky Red Line, and the Chevy HHR SS. It increases horsepower from 260 to 290 and torque from 260 pound-feet to 340 for the manual-transmission Solstice and Sky (325 for automatic models and 315 for the HHR). The kit will cost $650 (not including installation) and consists of an ECU reflash to up the boost and a new manifold-air-pressure sensor. A version for the Cobalt SS with the same engine is expected in a few months.