Do you need to have the charge pipes to go stage 2????
Based on my research, the charge pipes don't make a noticeable difference in flow. I have also read that hard pipes could potentially cause issues due to being "hard", while the stock piping is flexible and will move more freely with the torque of the motor.
It it also worth mentioning that most members recommend upgrading the intercooler pipe clamps to something of heavier duty.
I have an intake, cat back, and rear motor mount so I was planning on grabbing a DEPO intercooler (without the charge piping) and some better clamps. Then go with either COBB OTS Stage2 or a Strat tune (Strat more likely).