cold air intake.

[Kaotic Lazagna]

Also note where the power/torque increase will be.

Stock intake box provides good torque in the low end of the rpm range
SRI is more low to mid range pick up and won't make as much gains in the higher end
CAI doesn't have much gains (might actually lose torque) in the lower end and is more useful in the mid to higher end of the rpm band


So it all comes down to where in the rpm band you really drive in.