For my birthday, I picked up the GM Performance Parts Stage 2 kit for my Ion Red Line. It retails for $775.00 but gives a true increase of 40 horsepower through a new factory performance calibration, larger injectors, a smaller supercharger pulley and a shorter drive belt. This is actually a much better bang-for-the-buck than something like a K&N Typhoon Cold Air Intake which goes for $300.00 but only increases output by 5 horsepower. And it should also push me over the 300 horsepower mark!
