As you can see below the Wheel Horsepower of a 2.2l (L61) G5 is 144.21 WHP and 143.45 Torque after these mods:
Injen Ram Air Intake (now Cold Air Intake)
OBX Headers welded to a
High Flow Cat welded to a
2.5" Exhaust welded to a
Custom Sport Muffler
I also waited to use the Trifecta tuner so...