The Pontiac Solstice GXP, Saturn Sky Redline, and Chevrolet HHR SS are plenty of fun with 260 horsepower underfoot, and we can only imagine that the joy quotient increases as power improves. General Motors' performance division knows as much, and it's now offering an LNF Turbo Upgrade kit to kick its 2.0L turbo direct injection engine into gear. The kit consists of a new engine calibration and MAP sensors that will push your turbo four to 290 horsepower and up to 340 lb-ft of torque with the six-speed manual transmission (315 - 325 lb-ft with a slush box). The new factory turbo kit also keeps the precious warranty intact, which is a huge bonus over other aftermarket setups.

The LNF Turbo Upgrade also gives the GXP, Redline and SS the same "no-lift shift" functionality as the Cobalt SS Turbo, which enables you to shift without taking your foot off the accelerator. The kit also bumps the redline by 200 to 6500, but the hulkified 2.0L engine will now demand premium fuel to deliver its increased power delivery. The General is also working on a similar upgrade kit for the Cobalt SS, and it should arrive at your local Chevy dealer during Q1 2009. The LNF turbo kit delivers some added pop to three already fun vehicles, and it can be purchased at a GM dealer for $650.